Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. And it cruised silently and rode with less harshness than muscle intermediates. The Pontiac 301 EC (Electronic Controls) version offered in 1981 produced 155hp (116kW) and 245lbft (332Nm), although it's rumoured that the actual output was closer to 170hp (127kW). One of the key upgrades were the 6x4 heads. The four-barrel version, set up for sustained high speeds, had 390 hp. Sponsored Stories . Jim told HPP, "Since I was a young man in the '60s, I always thought how great it would be to find a true 100hp in a legendary 421 Tri-Power setup that retained its iron heads and intake. Modified versions of this engine were extensively used in NASCAR stock car racing and drag racing competition. Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . 1968 - 400 Ram Air II Round Port Code 96. It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport. The engine was available in all full-size Pontiacs. Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Catalina Vista 421HO Trophy V-8 Tri-Power 4-speed in 1964 the model with 4-door hardtop sedan body and V-8 6902 cm3 / 421.2 cui, 276 kW / 375 PS / 370 hp (max) offered since October 1963 for North America U.S. special version. A new engine was fast-tracked, its relatively late start allowing it to take advantage of developments proven in the Oldsmobile V8 and Cadillac V8. A big chunk of the appeal of the 1965 and '66 2+2 was the fact that you got a standard 421 under the hood: The 338hp, four-barrel 421-cu.in. Pontiac Engine Torque Specifications. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. However, a few dealers would offer them in the GTO or Firebird and do their own installations, such as Royal Pontiac who offered the "Bobcat" conversion. To learn about it, read. A three-speed stick was standard; a four-speed and automatic cost extra. The GTO came with a four-barrel 389 V8 with 335 horsepower. In 1961 and 1962 they were available with either one 4 barrel carburetor or a dual 4 barrel carburetor setup depending on whether the buyer wanted to head to the racetrack or drag strip. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. A larger 4in (101.6mm) ram air flex duct to the air cleaner from the left-hand fender, specific carburettor calibration for the Rochester Quadrajet, a "T/A 4.9" callout on the shaker, 60 psi oil pump, and cam similar in grind to the 220hp (164kW) 400 from the 19781979 model year were also included. Initial advance: 18-deg At the request of Ed Cole, general manager of Chevrolet, the layout was also used by the Chevrolet V8 released in 1955, an exception to the customary GM policy of allowing a division one year of exclusive use of an internally developed advance. The W72 Performance Package also included an upgrade to the rear differential ratio, setting the rear gear ratio to 3.23 for all 1977 and 1979 W72 Firebirds, with the exception being 3.42 for 4-speed equipped W72 Firebirds in 1978 only. In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). The 4-barrel version was available from 1978 to 1981 and the Turbo version was limited to the 1980 and 1981 model year, however, it was originally intended to be available for the 3rd generation Firebird before its cancellation by GM. It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. Laconic would be one way to describe this Pontiac's eBay listing, all it states is, "1966 Pontiac Ventura, 421 Tri-Power, 4 speed Runs/ Drives Great, Very Clean - Garage Kept".OK then, now you know what I know. The Pontiac 2+2 featured a 6.9 L V8 engine, heavy-duty front springs, dual exhaust and distinctive exterior body design. When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. [2] This was the engine installed in the Pontiac Executive line of large cars[3] and its largest station wagon, the Pontiac Safari. The 421SD was available in 1961 as a dealer option or over the counter then in 62 and 63 from the factory, and was fitted with a list of internal modifications designed solely to withstand the abuse of drag racing. Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. A higher-output four-barrel carburetor version was offered, called the 326 HO (High Output). Year: CU IN: Casting # 1967: 326. Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. It was renamed 428 HO for 1968. The 1968 Ram Air II remained at 400 cu. Size cfm: Total flow, 1,050 cfm The 1979 Firebird model line was the last year for the Pontiac 400, and by this point not only was it required with the 4-speed manual transmission, it also required the WS6 Special Handling Package as mandatory equipment. Though production cars only got the two hood air inlets the name was retained. From 1969 though 1970, the Ram Air IV was available in both A-Body (GTO, including Judge) and F-body (Firebird, including Trans Am) form. It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. A mere five were built, all with a four-speed transmission. The engine compartment of this concours Catalina is beautifully finished. In 1964 when the new "A" body intermediates came out there was a new corporate (GM) engine size limitation to anything less than 330cuin (5.4L). For 1967, Pontiac retired the 389cuin (6.4L) and replaced it with the 400cuin (6,554cc), a 389 bored-out by +0.06in (1.5mm) to a bore and stroke of 4.12in 3+34in (104.6mm 95.3mm). The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. 421 CID V8 - 4BBL - Automatic - P.S. (imp.) Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. Calling into play enormous power and a decent 55/45 weight distribution, the 2+2 could be launched with little tire spin and guided through corners with alarming efficiency. Wearing a revised GM B-body semi-fastback shape, the 2+2 option delivered a 421-cu.in. The Ram Air II also incorporated the first computer-designed camshaft. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . Two-barrel carburetor, 8.5:1 compression, 227hp (169kW) @ 4600rpm, 333lbft (451Nm) @ 2300rpm, Four-barrel carburetor, 10:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Two-barrel carburetor, 10.0:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Four-barrel carburetor, 10.25:1 compression, 270hp (201kW) @ 4800rpm, 359lbft (487Nm) @ 2900rpm. On premium fuel, it was rated at 207 hp at 5200 rpm and . Only one is known to survive today. From 1959 to 1966 Pontiac continues making improvements. To learn everything you need to know about car engines, see. Secondary: Front and rear #70 Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . The SD-455 motor was listed as an option in dealer brochures for the 1973 Grand Am and LeMans GTO(and planned for the Grand Prix as well) although none were produced for sale. Ever wonder what it would take to increase that number by 100? ENGINE. . A period-correct battery cranks the high-compression 469-cubic-inch Pontiac engine. Horsepower: See Part 2 Though a change of camshaft would delay production, Pontiac decided to change camshaft, employing one with identical timing to the 744 camshaft, which had been used in the 400 Ram Air(aka Ram Air III) engine with manual transmissions. Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. [9], The W72 engine was standard in all 1977 Pontiac Can Ams (bar the 1977 Can Ams sold in California/High Altitude states which received the L80 Oldsmobile 403) and was optional in all 1977-79 Pontiac Firebird Formula and Trans Am models. Plans were made to produce Firebirds and GTOs with advertised ratings of 355hp (265kW) and 375hp (280kW) respectively but concerns about emissions, the response of the automobile safety lobby, and the warranty implications of a high-revving street engine led to cancellation of the program.[why? This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. 1966 Pontiac GTO. cam specs out at 215/225-degrees duration at 0.050 and has just 0.407/0.407 lift with the factory 1.50:1 rockers. Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins Only about 400 were produced before the fuel injection system was quietly dropped. However, the 1959 389 engines had the generator in front of the heads with reverse flow cooling still in use. Effectively, Pontiac's V8s were all small blocks, sharing the same connecting rod length 6.625 in (168.3mm) (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines). Most Pontiac engines were painted light blue. These same heads were also used on the 1964 GTO 389 tri-power engines. ", https://tran-zam.com/fhistory/1977Engines.aspx, "Hitman's Pontiac Trans Am Site - WS6 and WS7", https://tran-zam.com/fhistory/1978Engines.aspx, https://tran-zam.com/fhistory/1975Engines.aspx, "Unsung Muscle: '75 455 HO Pontiac Trans Am", https://tran-zam.com/fhistory/1981Engines.aspx, "Directory Index: Pontiac/1967 Pontiac/1967_Pontiac_Performance_Brochure", "609ci Pontiac Ram Air V - Chief Stomp 'Em", Pontiac experimental V8 427 Hemi TOHC Tamrazs Parts (800) 442-4601, "McKellar's Masterpiece: The Pontiac Overhead Cam 421 V8", https://en.wikipedia.org/w/index.php?title=Pontiac_V8_engine&oldid=1136467635, Articles needing additional references from January 2010, All articles needing additional references, Articles that may contain original research from October 2016, All articles that may contain original research, Articles needing cleanup from September 2022, Articles with bare URLs for citations from September 2022, All articles with bare URLs for citations, Articles covered by WikiProject Wikify from September 2022, All articles covered by WikiProject Wikify, Articles with multiple maintenance issues, Articles with unsourced statements from December 2008, Articles with unsourced statements from April 2021, Articles with unsourced statements from February 2018, Wikipedia articles needing clarification from April 2021, Articles with unsourced statements from July 2016, Articles that may contain original research from September 2018, Articles with unsourced statements from March 2018, Articles to be expanded from February 2020, Articles with empty sections from February 2020, Creative Commons Attribution-ShareAlike License 3.0, 7.9:1, 8.0:1, 8.4:1, 8.5:1, 8.6:1, 8.9:1, 10.0:1, 10.25:1, 10.5:1, 10.75:1, 11.0:1, Two-barrel carburetor, 7.9:1 compression, 192hp (143kW) @ 4400rpm, 297lbft (403Nm) @ 2800rpm, Four-barrel carburetor, 8.9:1 compression, 216hp (161kW) @ 4800rpm, 315lbft (427Nm) @ 2800rpm, Two-barrel carburetor, 8.9:1 compression, 205hp (153kW) @ 4600rpm, 294lbft (399Nm) @ 2600rpm, Four-barrel carburetor, 8.9:1 compression, 227hp (169kW) @ 4800rpm, 312lbft (423Nm) @ 3000rpm. 1968 - 400 Ram Air I and 428HO Code 37" Ram Air I and. [11] By mid-1978, the W72 could no longer be ordered in conjunction with the MX1 3-speed Turbo-Hydramatic 350 automatic transmission, and could only be ordered with the 4-speed manual transmission. 1969 - 400 Ram Air III or 350HO Code 48. Rear Main Cap. Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. 1963 Pontiac V8 Engine Specs. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. The W72 package was a standalone option, and although was discounted when ordered in conjunction with the Y82/Y84/Y88 Special Appearance package, did not come included with Special Edition Trans Ams, it remained an extra cost option. Pontiac still offered the regular 455 (RPO L75) in its full sized cars, and after a negative public reaction for dropping the 455 engine, it was re-introduced mid-year as an available option for the 1975 Pontiac Trans Am. Price $14000.00. The first of the "big journal" Pontiac V8s, it had a bore and stroke of 4+332in 4in (104.0mm 101.6mm) and came with dual four-barrel carburetors. This was based on results of over 1 million test miles, which was unheard of at the time. [19], Parts for Ram Air V engines are not readily available. [citation needed]. Only about 2000 like this one were built with 4 speed Muncie transmissions. However, it can easily be determined by examining the cost price of the option, where the package excluding the W72 engine cost $251, and with the engine, cost extra at $324.[10]. Pushrods: LPC chrome moly 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. Cam was a #541596 McKellar No. Pontiac's V8s share the same 6.625in (168.3mm) connecting rod length, with the exceptions of the later short deck 301, 265, and 303 Ram Air V. Most Pontiac V8s had an overall length (to the edge of the water pump pulley) of 28.25in (718mm), an overall width of 27in (690mm), and a height (not including air cleaner) of 31in (790mm). This installment includes the assembly and parts selection up to the long-block. Coil: GM 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. Over the years he has amassed a library of data from investing in metallurgical testing with a well-respected laboratory. The 287 was an "oversquare" engine with a bore and stroke of 3+34in 3+14in (95.3mm 82.6mm), for a total displacement of 287.2cuin (4.7L). 540306 featured 1.92/1.66-inch (49/42mm) valves and was carried over from the previous model year, production stopped in March 1962 and then casting No. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. Pontiac offered this to the public as a streetable version of the 421 SD. That's the factory rating of the legendary 421 H.O. The 389 V8 was first introduced by Pontiac in 1959. The tri-power equipped XS-code 389 was shipped with the Ram Air pan in the trunk, and the dealer had to fit it and cut out the underside of the hood scoop to make it functional. It shared the 4.121in (104.7mm) bore of the 400, but with a 2.84in (72.1mm) stroke for a displacement of 303cuin (5.0L). Transistorized ignition was available. 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . Seat pressure: 110 pounds at 1.600-in Primary tube diameter: 1.75-in 1966 Pontiac Ventura Specifications. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. 5 January 2007. All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Preparation: Disassemble, check ball seat for width, spring tension, plate clearanceHEADS Simply put, what good is the power if the engine does not last? Cam choice is always extremely important, and Jim decided to go with an aggressive Crower mechanical flat-tappet stick with 247/252-degrees duration at 0.050 and 0.515/0.525 lift (0.495/0.505 with 0.020 lash) with 1.6:1 rockers. 1966 Pontiac Catalina Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! 1966 yk 421 376 a 3x2 1967 zg 230 165 a 1 1967 zm 230 165 a 1 1967 zk 230 165 3 m 1 1967 zs 230 165 3 m 1 . The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. 1967 was the last year for closed-chambered heads. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. Optional engines included the 356hp Tri-Power as seen on our feature car (code WH manual or YJ auto), or the 421HO, rated at 376hp . Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION 1966: 421: 9782611 (late) 1967-1969. Intake manifold: Original '64 PMD tri-power Upon reflection, many did not consider that it was the only large displacement engine still on offer for any performance car on the market, and reconsidered Pontiac's position between the rising CAFE emissions restrictions.[14]. Pre-Owned. . Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust The Block Date Code represents the production date of the engine. The 1955-up Pontiac V8 that finally reached the public was an overhead valve engine with cast iron cylinder heads and block and wedge-shaped combustion chambers. The 400 2-barrel kept the 17 degree valve angles for '67; starting in '68 all Pontiac V8s went to the 14 degree valve angle. Officially named the Quadra-Power 400 for 1967 and renamed 400 HO for 1968, the 400 HO was first offered for 1967 as the third engine in the GTO line after the automatic-only 400 2-barrel and the standard 400 4-barrel (the 400 HO would not be offered in the Firebird until the 1968 model year). However, the engine used in these Trans Ams was the same regular production 455 taken from the big body cars Pontiac was producing, and output 200 HP with a torque rating of 330lbft at 2,000 rpm.[13]. 18 watchers It was rated at 475hp (354kW). Model Number: Body/Style Number: Body Type & Seating: Factory Price: . Once corrected the SD-455 was recertified and was released for production in late April 1973. All 196869 #9792506 Ram Air 400 blocks have 4-bolt caps. This is it! 093: 66 389 GTO: 65 . 301 4-barrel 'W72' or 'ESC' (170hp, 127kW) (with the 5th character of the VIN being a "W" for 1979-1980 and the 8th for 1981). It was offered in the following forms: For 1957 the V8's stroke was increased to 3.5625in (90.49mm), for a displacement of 347cuin (5.7L). The W72 also featured a camshaft with a higher duration, finer tuned 800cfm Rochester Quadrajet, insulated fuel line, larger 60PSI oil pump, chrome valve covers, a larger harmonic balancer, and the "T/A 6.6" Shaker decal. Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. Simply called "Ram Air" by Pontiac[17] it was the first in a series of engines available from Pontiac as regular production line options and officially called Ram Air. . Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. At the end of 1976, Pontiac was no longer able to continue production of the 455 (7.5 L) V8 motor due to the tightening emissions requirements. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. The next 1 or 2 numbers represent the date, and the last number is the year. - P.B. Despite their work, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 until later in the 1950s. As with all other Pontiac V8 motors that evolved from the 316 V8, the 421 was simply a bored out and stroked version of the popular Pontiac 389 V8. which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. For 1965, however, the 2+2 became a bonafide muscle car. Stock Pontiac Engine Specs. This is the original car featured in the May 1962 issue of Motor Trend Magazine that was modified by Royal Pontiac and driven by Jim Wangers. superior_queens (3,035) 100%. Preparation: File-fit for end gap if needed, wash He thinks the stock exhaust flow of 180 cfm will suffice for this build. Pontiac listed the 290hp (216kW) rating at 4000 rpm for a motor that had a 5700rpm redline on the factory tachometer. Oil pump: . Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. [citation needed] It was the first engine that incorporated Pontiac's round-port head design in a production vehicle, however the intake port was the same as other D-port heads, leaving a head which exhaust port could nearly match the intake at high valve lifts. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. In 1967, the Pontiac 2+2 became an option on the . The inlets were all well within the boundary layer that exists close to the surface, so all of these systems would more accurately be described as "outside air induction" systems, benefiting from the intake of cooler, and thus denser, outside air versus the comparatively hotter and less dense air under the car's hood. [22]. . Ellingson Motorcars (877) 638-7170. Low-performance and two-barrel applications, the standard engine in full-sized Pontiacs, got 1.96in (49.8mm) intake and 1.66in (42.2mm) exhaust valves and pressed in rocker arm studs. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. The short-deck block and different intake ports also required the design of a new intake manifold. Method used to retain pins in pistons: . Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM The head design was incorporated from the earlier 1970's 350 Pontiac heads, and could satisfy emissions in all states except for high-altitude emissions states and California. Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. Bolts or Parts: Lube or Sealer: Torque to: Main Caps. The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. The piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. Compression ratio was a modest 8.00:1, with valve diameters of 1.781in (45.2mm) (intake) and 1+12in (38mm) (exhaust). Are you thinking of buying a 2007 muscle car, or any other car? Pontiac Engine Torque Specs Pontiac Engine Torque Specs. [5] It was rated at 360hp (268kW), but the Grand Prix with the same specifications was rated at 370hp (276kW).[6]. 1. Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . In 1969, Pontiac unveiled its Trans Am model Firebird, and since racing rules required engines of less than 5L (305.1cuin), Pontiac unveiled the 303 for racing models only, never available to the public. So large are the intake ports that the pushrods run through the center of each port via pressed-in tubes, in addition to streamlined airfoils over the tubes themselves to improve port shape, and increase flow velocity. The 301 had a bore and stroke of 4in 3in (101.6mm 76.2mm). Collector size: 3.00-inGASKETS Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. The 670 heads were used until May 1967 when they were upgraded to become the "97" heads, which were then replaced late in the model year by the "997" heads which incorporated the upgrades of the "97" heads. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. But the "Ram Air" 400 also mandated steep 4.33:1 gears(or 3.90:1 in Firebird), making the Quadra-Power 400 (400 HO) the top practical street engine option for most drivers. (V8) - Stamped on right front side of block or beneath production . The valve angle was reduced from 17 degrees to 14 degrees for better breathing. Free shipping on many items | Browse your favorite brands | affordable prices. Unfortunately, that's what happened with the 1963 Pontiac Super Duty 421. 1966 Pontiac Catalina Specifications and Production. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. Greater throughput mixed with the proper amount of fuel and ignited at the ideal time for the flame to expand against the piston will result in more power. Head bolts do not pull on the cylinder wall causing distortion. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. Example: A128 = January 12, 19*8. Given that, it was no accident that the leader in intermediate muscle also put together the finest full-size performance machine -- the 1966 Pontiac 2+2. According to the June 2019 issue of Muscle car Review magazine, during dyno testing performed during that era, the National Hot Rod Association (NHRA) rated this Pontiac W72 400 T/A 6.6 engine at 260 to 280 net horsepower instead of the 220-hp rating published by Pontiac. Initially marketed as a 287cuin (4.7L), it went on to be manufactured in displacements between 265cuin (4.3L) and 455cuin (7.5L) in carburated, fuel injected, and turbocharged versions. The 1969 HO 350 HO was equipped with the 400cuin (6.6L)'s large valve heads (# 48's) and the 400 HO camshaft and rated at 330hp (246kW). On this Wikipedia the language links are at the top of the page across from the article title. The goal of making a Pontiac Hemi succeeded but the engine was never produced. Not where most enthusiasts go first. Using an equation the author has provided in HPP many timesmost recently with The Mule engine seriesit was revealed that around 228.6-cfm flow though the intake port of the cylinder head is required to produce the desired 470 hp. An example of data being processed may be a unique identifier stored in a cookie. Along with proper parts selection, accurate machining and assembly are also important or Best Offer. According to GM mandates horsepower was now rated in net figures as opposed to gross, so on paper the 1972 455 HO appeared to have a significant drop in power, but in fact it was very much the same engine, and performance figures reveal this to be true. Information and specs for the Pontiac 421 V8 engine. It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. The camshaft was also revised to have a slightly higher duration, the carburettor jets tuned and a dual exhaust was implemented allowing the power to increase to 220hp (223PS; 164kW) at 4000 rpm and 320lbft (434Nm) of torque at 2800 rpm. Total Timing: 36-deg BTDC The "455 HO" moniker took on a whole new meaning with the introduction of the 1971 model year; Intended as a low compression progression from the previous years Ram Air IV engine, all 1971 455 HO engines used a heavy duty 4 bolt main block, round port cylinder heads (casting #197; with 8.4: compression), "Ram Air" style exhaust manifolds, and a two-part aluminum intake manifold. This was the beginning of factory supplied performance items such as 4 bolt main bearings and windage trays to reduce friction from crankcase oil. 1966 Pontiac Catalina . Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. Jim Taylor, well-known Pontiac engine builder, had that question on his bucket list for years.
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Gloucester City, Nj Arrests, Articles OTHER