By 1965 and 1966 the same combinations would be rated at 338hp (252kW) for the 4bbl and the two Tri-Power versions would be rated at 356hp (265kW) and the H-O version at 376hp (280kW). Two tri-power 421s were optional, one with 356 bhp, the other with 376. Pre-Owned. According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. All Rights Reserved. The 301 Turbo package mandated air conditioning, the THM350 (sometimes referred to as the CBC350 in various literature) non-lockup automatic transmission (THM350C lockup in 1981 Trans Ams), and 3.08 rear axle gearing. Given how late in the model year it was, Pontiac decided not to incur the costs of recertifying the SD-455 for other models other than the Firebird. The 455 was used through 1976 when it, as with many other large displacement engines, was discontinued as manufacturers moved to smaller, more efficient models, even in their full size car lines. These same heads were also used on the 1964 GTO 389 tri-power engines. Though production cars only got the two hood air inlets the name was retained. 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). The 421 badging was standard on the 2+2, the 421 H.O. Under the leadership of chief engineers Pete Estes and John DeLorean, Pontiac engine guru Malcolm "Mac" McKellar (1920-2011) and crew developed the Super Duty 389 and 421 NASCAR engines that embarrassed the Fords and Chevrolets at Daytona. Despite their work, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 until later in the 1950s. Offered from 1967 to 1969, it produced 360 and 376hp (268 and 280kW) in 1967, 375 and 390hp (280 and 291kW) in 1968 and 360,370 and 390hp (268,276 and 291kW) in 1969. Also added was the #48 casting number heads with a 68cc (4.15cuin) chamber for higher compression, along with larger 2.11 and 1.77in (54 and 45mm) valves. 389 Pontiac Engine Build - Restore An Old Car 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. What was most interesting about the 421 engine in the beginning was that it was a dealer installed option only known as the SD (Super Duty) 421. This had extra-rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit to allow the Power Enrichment Vacuum Regulator (PEVR) to release the primary metering rods to move to the up position (enrichment) anytime during boosted conditions. 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. A limited-slip differential and gearing up to 4:11.1 were optional. However, the 1959 389 engines had the generator in front of the heads with reverse flow cooling still in use. Ram Air induction was optionally available with the 455 HO in the Firebird Formula (standard on Trans Am), and the 2-door LeMans (including GTO). Neither casting was equipped with an exhaust crossover. Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. Pontiac Heads - Butler Performance 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. Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. Pontiac's 428 was a sneak attack in the muscle car horsepower wars The 1968 Ram Air II remained at 400 cu. There was also the addition of dual exhaust, and for vehicles equipped with a manual transmission, a slightly more aggressive camshaft. On the invoicing for the 1979 model year Firebirds, they had the option listed as L78, however, every 1979 400 equipped car received a W72 engine. 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. 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. The 301 Turbo was unique since it had a beefier block than the 197779 versions (which carried on in the non-turbo versions in 1980 and 1981), a very mild camshaft with 0.35in (8.9mm) lift and 250 degrees gross duration, a 60psi (4.1bar) oil pump to ensure adequate oil to the oil-cooled Garrett TBO-305 Turbocharger, a rolled fillet crankshaft, a fully baffled oil pan, and a specific 800cuft/min (23m3/min) Quadrajet carburetor. VEHICLE TYPE . Engine Oil: 120 ft-lbs. . For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). There were a few 1962 Grand Prix models that came with a 421 SD from the factory so if someone is lucky enough to have one today then they have a car that is probably worth some decent money simply because of the rarity of these models.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[580,400],'enginefacts_com-medrectangle-3','ezslot_2',115,'0','0'])};__ez_fad_position('div-gpt-ad-enginefacts_com-medrectangle-3-0'); Engine Facts 2023. Maximum flow at 28 inches of water Total Timing: 36-deg BTDC 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. Rings: LPC (Liberty Performance Components) premium moly, standard tension pontiac engine decoder year code c/i hp tran carb car misc 1962 13b 421 3 m 2 x 4 full super duty 1962 13u 421 4 m 2 x 4 full super duty 1962 bu 421 4 m 2 x 4 full super duty . An example of data being processed may be a unique identifier stored in a cookie. in., again available only in the GTO and Firebird. Installed position: 110-deg However, in the June 1974 issue of SUPER STOCK AND DRAG ILLUSTRATED, a new 1974 Trans Am with the SD-455 motor ran 14.25 @ 101mph (163km/h). 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. 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. Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. A mechanical system built by Rochester, it was similar in principle, but not identical, to the contemporary Chevrolet "fuelie". Size cfm: Total flow, 1,050 cfm Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. Pontiac Engine Torque Specs - Butler Performance . Only about 2000 like this one were built with 4 speed Muncie transmissions. engine, dual exhausts, three-speed manual transmission, Hurst shifter, 3.42:1 rear gears, heavy-duty suspension, bucket seats, upgraded upholstery, carpet, emblems, "Decor" louvers, pinstripes, lower . 15 GTO facts you might not know about America's original muscle car Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. As Stock drag racing heated up at the dawn of the Sixties, the factories were serving up a constant stream of engines, transmissions and lightweight body par. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. In 1969, Pontiac also used a revised crankshaft out of a Pearlitic malleable-iron, although it still used the "N" casting letter. 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. Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). Exhaust: 180 cfm at 0.500-in The 1972 455 HO was rated at 300hp (224kW) @ 4,000rpm and 415lbft (563Nm) @ 3,200rpm. One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. Ever wonder what it would take to increase that number by 100? 1966 Pontiac Gto Glendale, Arizona | Hemmings Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor Royal Pontiac's engine swap wasn't a new trick for Pontiac. RamAir 4 Motor Price $15500.00. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . Chamber: Closed, special to PMD, 70 cc . Tri-Power equipped Pontiac hot roda stout piece by anyone's standards. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. A total of 1,808 Ram Air IV production cars were built over its 2-year production. All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . 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. This is it! 1966 Pontiac Catalina technical specifications and data. Block description: '64 421ci #157 The rod weighs 751 grams versus the stock rod at 958 grams. In addition, a shallower spherical-wedge combustion chamber moved the tuliped valve heads .040" closer to the piston at TDC, improving mixture draw considerably during the intake stroke. 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? 1966 Pontiac Ventura Specifications. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. This simply meant that Pontiac installed both the SD-389 and SD-421 into vehicles on its assembly line. Required airflow at 28 in/H2O = HP/ # of cylinders/0.257 For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). [19], Parts for Ram Air V engines are not readily available. Located at the back of the engine near the Distributor. Casting No. It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. 068) to 301/313 (No. Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. 4/21: Not just a date, but a legendary 421-cid Pontiac engine that The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. 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. Perhaps the most unusual variation of the Pontiac V8 was the 1961-63 Trophy 4, which was a 45-degree inclined 194.43cuin (3.2L) inline-4 created from the right bank of the 389 for the debut of the Tempest. Not where most enthusiasts go first. 421 H.O. Tri-Power Engine Build - Part 1 - High Performance Pontiac Factory heavy-duty high-pressure oil pump and eight-quart sump, four-bolt main bearing caps with Moraine aluminum bearings, and #1110976 dual-point distributor without vacuum advance. 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 Engine Torque Specs Pontiac Engine Torque Specs. . In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. 1967 - 400 Ram Air Code 97. This same camshaft was also used in Pontiac's 19691970 RA IV production cars. . The cylinder heads on the 400 CID version had an intake port volume of 290cc (17.70cuin), nearly twice the size of a typical standard D-port Pontiac head - and flowed in the area of 315cuft/min (8.9m3/min) @ 0.8in (20mm) valve lift; in the realm of the NASCAR-dominating Chrysler 426 Hemi. The Pontiac 455 V8 was The GTO and Firebird Brand's Last "Big Block" Fuel pump: Will use 110-gph Carter 1966: 421: 9782611 (late) 1967-1969. Cam was a #541596 McKellar No. In 1963 Pontiac dropped the Buick division built 215 cu. PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . Carb: (3) Rochester two-barrels PMD The engines feature a cast-iron block and head and two valves per cylinder. 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. Along with being cheaper to build, this allowed more consistent valve action with less weight than a conventional shaft. Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Preparation: Wash after balance for assembly A period-correct battery cranks the high-compression 469-cubic-inch Pontiac engine. Pontiac introduced the OHC 6 in two flavors for '66: a base engine with a one-barrel carburetor that developed 165 hp at 4700 rpm, and a sportier version with a 10.5:1 compression ratio, a high-lift cam, a split exhaust manifold, and GM's new four-barrel Quadrajet carburetor (below). Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke Horsepower: See Part 2 In 1967, Pontiac moved on to a technologically simpler nodular cast iron (invented in late 1940s) crankshaft, which they used until 1975. Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins 744) and a new valve spring package with dampers to positively control valve action. 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. 1966 Pontiac Catalina 421 H.O. Gives New Meaning to the Term 'Full Floater' Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . 1966 Pontiac GTO - Muscle Car Facts Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). 5 January 2007. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. 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. The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 The four-barrel 400 was a popular performance option for many of Pontiac's cars. 1. By comparison, the factory 421 H.O. This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. Brand: Fel-Pro head and intake/ SCE pan and timing cover Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. [citation needed]. Pontiac V8 Engine Codes and Specifications. 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). Pontiac ignited the classic muscle car era with a stroke of marketing genius. Building a rare Pontiac Catalina Royal Bobcat piece by piece Example: A128 = January 12, 19*8. 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. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. While production of 196970 A-body Ram Air IV cars was low at just 1563 units(759 1969 GTOs including 302 Judges, and 804 1970 GTOs including 397 Judges) 1969 and 1970 model year F-body Ram Air IV cars were even rarer at just 245 total units produced. 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. Now select an engine model (if applicable) -- Pontiac Engine Models -- All Pontiac Kits 151 301 326 350 3800 389 4-cylinder 400 421 428 455 Brodix Heads Edelbrock Heads Iron Duke L67 Pro Stock Dart Heads Pro Stock Heads Ram Air Runner Heads Super Duty Generic V8. For the 1978 model year, Pontiac re-incorporated the earlier thicker cast cast engine block denoted by the cast number 418988 and a "XX" cast into the side of the block. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. In the 1960s the popular 389cuin (6.4L) version, which had helped establish the Pontiac GTO as a premier muscle car, was cut in half to produce an unusual, high-torque inline four economy engine, the Trophy 4. or Best Offer. 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. It used a declutching fan, special exhaust manifolds, and chrome low-restriction air cleaners; rocker covers and oil-filler cap also were chrome. The valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. Pontiac V8 Cylinder Heads - Wallace Racing Forged steel 6.625in (168.3mm) rods (Ram Air V style), Large-valve heads (valve diameter): 2.4in (61mm) intake, 2in (51mm) exhaust, Small-valve high-RPM head (valve diameter) 2.19in (56mm) intake, 2in (51mm) exhaust. 1966 Pontiac Catalina technical and mechanical specifications 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. The 1981 rendition of this engine was officially called the 301-EC [EC standing for Electronic Controls] in the 1981 GM factory service manual, removing the need for a W72 option separately as it was now the standard motor, similar to how all W72 engines in 1979 were coded L78.[16]. [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. Pontiac offered this to the public as a streetable version of the 421 SD. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. This included the ESC (Electronic Spark Control) distributor and controller borrowed from the 301 Turbo, which allowed for higher timing without the penalty of engine damaging pinging or preignition. 1966 Pontiac 2+2 $64,995. designs, the SD-455 was a much improved engine. 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. Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . The 421 SD became factory installed in 1962 and in 1963 a street version became available from the factory with a dual four-barrel or three two-barrel Tri-Power carburetion. Mods: Intake port match, valve bowl blend, improved short-turn radius Oil pump: . All 1980 Trans Ams received this engine as standard with the option to delete this engine choice as a credit option for the standard L37 301. Spiral clip ENGINE. 421 Tri-Power/Hurst 4-Speed: 1966 Pontiac 2+2 | Barn Finds To determine horsepower from airflow, invert the equation: Here is another number to ponder: 370 hp. Read. This installment includes the assembly and parts selection up to the long-block. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. Muscle Cars. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. 1967 was the last year for closed-chambered heads. The 421 SD produced up . Collector size: 3.00-inGASKETS These are general guidelines. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. It had a four-barrel carburetor, dual exhaust, and higher compression, and was good for 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 - 1966 and the final year, 1967. Update your shipping location. Note the tri-color Pontiac Ventura upholstery. The 1979 W72/WS6 equipped Trans Am was considered to be one of the overall best performing cars of the decade due to having a powerplant that produced more power than any other competitor on the market at the time with handling equipment to supplement the performance.[12]. Its cast "670" heads had taller valve spring heights than the standard D-port heads, and the only 14-degree valve angle closed combustion chamber making these heads unique. Maximum RPM (high-RPM engine): over 8000 rpm, Engine weight: estimated 550lb (249kg) complete, Power: estimated 640hp (477kW) at 7500rpm, This page was last edited on 30 January 2023, at 13:15. Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. That's the factory rating of the legendary 421 H.O. It was renamed 428 HO for 1968. A History Lesson in Pontiac V8 Power - Engine Builder Magazine It included a new camshaft with duration increased from 288/302 (No. Known as GM's performance-oriented division, Pontiac lived up to the hype by creating the first Muscle Car and kicking off the Muscle Car era. This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. Offered on select models from 1957 through 1966, Pontiac's Tri-Power induction system added a new dimension of performance to the General Motors brandand a colorful new term to the hot rodder's vocabulary. In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. Shipping to: 98837. The first letter equals the month. By early 1979, orders for the W72 package were being rejected by dealers as they supply had run dry. Pontiac 2+2 - Wikipedia 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 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. The 421 was first availabe in a SD (Super Duty) model that was built for racing. Pontiac went to open-chambered heads in some 1967 models and all 68 and up to improve power, engine breathing and reduce emissions. aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. Pontiac's initial plans were to use a camshaft with specs identical to the 041 Ram Air IV camshaft, but testing showed emissions, while technically compliant, did not have "cushion" to satisfy Pontiac's emissions engineers, to avoid production variation leading to any non-compliant engines being produced and sold. Pontiac V8 Engine - The engine that sparked the Muscle Car Era 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]. [7] Though listed as slightly less powerful than some high-performance iterations of the 400 (such as the 366hp (273kW) Ram-Air), the 455 had 500lbft (678Nm) of torque, 55 more lbft (75Nm). Pontiac Grand Prix - Muscle Car Club Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. 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. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. 1969 - 400 Ram Air III or 350HO Code 48. This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . Preparation: Disassemble, check ball seat for width, spring tension, plate clearanceHEADS Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. 1962 Pontiac Catalina 421 Super Duty Royal Bobcat - Collector Car Ads Are you thinking of buying a 2007 muscle car, or any other car? Only one is known to survive today. 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. The Pontiac 2+2 featured a 6.9 L V8 engine, heavy-duty front springs, dual exhaust and distinctive exterior body design. By 1963 Pontiac decided it was time to release the 421 V8 officially to the general public and the motor would continue to be available until the end of the 1966 model year. By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly. 1966 Pontiac Grand Prix - conceptcarz.com The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. Lobe separation angle: 112-deg With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. Preparation: Magnaflux, check for equal stroke and index, grind, polish 0.010-in [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. It was factory rated at 366hp at 5,400 RPM and 445lbs.ft.

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