Diameter: 516-in Collector size: 3.00-inGASKETS Math, not gasoline, makes horsepower under the hood of a Pontiac. Also bowing in 1967 was the new Firebird, which had the . Simply put, what good is the power if the engine does not last? Some production test cars ran considerably slower and yielded 14-mile (402m) times in the 14.5 second/98mph (158km/h) range in showroom tune (uncited sources)- results that are quite consistent for a car with a curb weight of 3,850 pounds (1,746kg) and the rated 290hp (216kW) SAE NET figure that some sources suggest was "under-rated." for 1980, and the 8th being a "T" for 1981). In 1967, Pontiac moved on to a technologically simpler nodular cast iron (invented in late 1940s) crankshaft, which they used until 1975. Casting No. The 1966 Pontiac Ventura doesn't necessarily come up when speaking of 60's muscle cars, but the type of V-8's offered with the Ventura meant plenty of power. engine for 1963 is reported to be putting out 500 ft-lbs torque at 4,200 rpm and . Transistorized ignition was available. The crankshafts were also unique in the fact that they featured only two counter weights instead of the usual five and also featured lightened connecting rod journals. Whether all were installed in GTOs is unknown. Stock Pontiac Head Specs - Ron's Pontiac Page Pontiac listed the 290hp (216kW) rating at 4000 rpm for a motor that had a 5700rpm redline on the factory tachometer. The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. The 1970 '455 HO' was a conventional "D" port engine. The engine compartment of this concours Catalina is beautifully finished. Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? On this Wikipedia the language links are at the top of the page across from the article title. 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. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. [4] It was replaced by the 455 for the 1970 model year. Not where most enthusiasts go first. Pontiac 421 V8 Specs, Firing Order and Engine Information - Engine Facts 1969 - 400 Ram Air III or 350HO Code 48. 3.75. Royal Pontiac's engine swap wasn't a new trick for Pontiac. Unusual for a major automaker, Pontiac did not have the customary "small-block" and "big-block" engine families common to other GM divisions, Ford, and Chrysler. 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 had 2-bolt main bearing caps in 1969, but went to a block similar to the Ram Air IV's in 1969 that was drilled for 4-bolt main bearing caps (but used a cast crank and cast rods). [8] All of these improvements provided the W72 with a power rating of 200hp (203PS; 149kW) at 3600 rpm and 325lbft (441Nm) of torque at 2400 rpm, while the standard L78 400 only produced 180hp (182PS; 134kW) at 3600 rpm and 325lbft (441Nm) of torque at 1600 rpm. Pontiac 2+2 - Wikipedia This was to ensure there was enough fuel to cool the cast offset dished pistons. 400 Ram Air (1969) / Ram Air (1970), aka Ram Air III, Learn how and when to remove these template messages, Learn how and when to remove this template message, "Tested: 1968 Pontiac GTO 428 / Royal Bobcat", "1969 Pontiac Grand Prix 428 specifications | technical data | performance | fuel economy | emissions | dimensions | horsepower | torque | weight", "Muscle Car Horsepower How Exaggerated Was It? The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. 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. Prices ranged from $2,760 to $3,220 . Tested: 1968 Pontiac GTO 428 / Royal Bobcat - Car and Driver 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. The heads were a new design featuring siamesed intake ports. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. Pontiac successfully competed against more-expensive inline four-cylinder models with their inline flathead six-cylinder engines. Pontiac V8 Engine - The engine that sparked the Muscle Car Era The 2+2 option package arrived for 1965, giving the Catalina a performance persona and credentials to match. All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Pontiac produced the 421 V8 engine from 1961 to 1968. The first letter equals the month. After outselling Oakland, Pontiac became the sole survivor of the two by 1932. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. 1966 Pontiac Catalina Specifications and Production. 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. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. Not long before the model year introduction, Pontiac management decided that the entire line would be V8-powered. PDF Pontiac Engine Decoder It was removed from the design for the 1960 model year because designers moved the generator and the power steering pump from atop the front of the engine down to the front of the heads to accommodate a lower hoodline. 1966 Pontiac 2+2 $64,995. Pontiac in the 1950s was one of a few US manufacturers that did not regularly identify their engine names and sizes with air-cleaner or valve-cover decals. Preparation: Cook, bead blast, magnaflux, bore, true decks, align bore The last was the 421 HO and included a high-output camshaft and valve train. [citation needed]. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. 1966 Pontiac Catalina - Oldride What is important is the total timing, the . Final torque ratings may vary and need to be determined based on application and parts used. 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 326 subsequently became the optional V8 engine for Tempests, and later the Pontiac Firebird, through 1967 and maintained the 17 degree cylinder head valve angle for its entire production run. 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 . It was factory rated at 366hp at 5,400 RPM and 445lbs.ft. It used a declutching fan, special exhaust manifolds, and chrome low-restriction air cleaners; rocker covers and oil-filler cap also were chrome. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. The Ram Air IV also used a lightweight aluminum intake-manifold that produced a weight savings of 1015lb (4.56.8kg). 093: 66 389 GTO: 65 . The concept car Pontiac Strato-Streak was used to introduce the V8 and in later years the engine was installed in Pontiac products. For a few more ponies through better oil control, a factory full-length windage tray will be added, since Pontiac didn't use one on this engine originally. A limited-slip differential and gearing up to 4:11.1 were optional. 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. . As a result, peak horsepower dropped from 310 to 290, though torque increased from 390 to 395lb. 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. Block casting # 9773157. 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. (V8) - Stamped on right front side of block or beneath production . Note the tri-color Pontiac Ventura upholstery. An innovative design feature was mounting the rocker arms on ball pivots on studs set into the cylinder head, rather than using a separate rocker shaft. 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. 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. 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. View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. Furthermore, this car had an automatic, air conditioning, a 3.08 axle and weighed 4,010 pounds (1,819kg). 1966 Pontiac Bonneville Convertible full range specs - Automobile-Catalog Intake: 218 cfm at 0.500-in The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. Preparation: Install in rod, torque, measure ID 1966: 421: 9782611 (late) 1967-1969. The camshaft was the HO cam with 288/301 duration. SPECIFICATIONS. 1968 Pontiac GTO 428 / Royal Bobcat. Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. Only about 400 were produced before the fuel injection system was quietly dropped. . 1966 Pontiac Catalina technical and mechanical specifications There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. It shared the 389's 3+34in (95.3mm) stroke, but its bore was 3.78in (96.0mm) for a displacement of 336.66cuin (5.5L). Engine Specifications. This new material had stronger alloys in the iron. 1966 Pontiac Catalina technical specifications and data. The next 1 or 2 numbers represent the date, and the last number is the year. CO2, . The 421 badging was standard on the 2+2, the 421 H.O. Projects - 1964 PONTIAC 421 HO Engine Build | The H.A.M.B. It also sports the four-speed manual, limited . The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. Method used to retain pins in pistons: . Standard ratio with the 400 was 3.55:1(except 3.36:1 in Firebird for 1969) regardless of transmission(3.23:1 for cars with air conditioning). 1965 Pontiac Bonneville Convertible | Hemmings 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]. 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. Reductions in reciprocating weight free up horsepower. 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. Pontiac V8 engine - Wikipedia The SD-455 used round-port cylinder heads similar to those used on the 1971 and 1972 455 HO, with specific "LS-2" intake and cast-iron exhaust header manifolds. Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. While not related to the 400 W72, the concept was the same. The Ram Air IV replaced the Ram Air II in 1969. It was rated at 366bhp (273kW) (gross) in the GTO version. 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 Pontiac 389 engine was produced from 1959 to 1966, and has a 4.06" bore and 3.75" stroke. The W72 offered many improvements over the standard L78 400 Pontiac. [19], Parts for Ram Air V engines are not readily available. 1966 Pontiac GTO. 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. 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. Though production cars only got the two hood air inlets the name was retained. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . Spiral clip For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. Melling PN M54D with 60 psi spring, made 70 psi at 6,000 rpm with 30W oil 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). Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. The crankshaft in the 428 had a "N" cast on them (designating nodular steel) as opposed to the 421's Armasteel. / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs Piston pins: Icon, SAE 1016 to 1022 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). The heart of the build, a code 45B 1964 421 HO 370 HP manual trans 4-bolt main block, all Pontiac 421 engines without exception had 4-bolt main caps. For 1967 only Pontiac called this engine the Quadra-Power 428. Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. Bearings: Sealed-Power mains and rods, cam Dura-Bond 1962 - 389 SD Code 544127. In 1968 the 326 was replaced by the similarly 389-derived 350, which used a 3+78in (98.4mm) bore and 3+34in (95.3mm) stroke for a total displacement of 353.8cuin (5,798cc). The Pontiac 455 V8 was The GTO and Firebird Brand's Last "Big Block" Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . Torque: See Part 2 The engine build will be discussed in two parts. Only one is known to survive today. This was the beginning of factory supplied performance items such as 4 bolt main bearings and windage trays to reduce friction from crankcase oil. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. This was a completely stock car on loan from a private owner for the test. . When fitted with other high-airflow components, it produced a good balance of low-end torque and higher-RPM power. The 421 was first availabe in a SD (Super Duty) model that was built for racing. 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. Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. The 421 SD Tri-Power engine offered during these years produced the highest horsepower of any motor in the Pontiac V8 lineup at 376 bhp. Block description: '64 421ci #157 For '65, the 421-cid V-8 became a standard part of the option package, and for '66, Pontiac made the 2+2 a separate model, still based on the Catalina two-door hardtop or convertible. Example: A128 = January 12, 19*8. 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. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. A set of Hooker Super Comp headers will be used on the dyno, and Jim is porting the stock heads to increase intake-port flow by 30 cfm. 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. Fuel line size: 38-inch, 516-inch to carburetor 1966: 421: 9782611 (late) 1967-1969. The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. 1966 Pontiac 2+2: A Profile of a Muscle Car | HowStuffWorks The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. 63 421 SD: 64: D-Port: 2.02/1.76: 77: 65 GTO, 65 421 HO: 65: D-Port: INTAKE MANIFOLD BOLT PATTERN IS THE SAME FOR ALL 65-79 HEADS. Along with a cam swap it boosted horsepower from 325 hp with the four-barrel carb to 348 hp in '64. This was a project started with the end goal of building a 427 Hemi. Pontiac V8 Engine History: 1955-1981 Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). The Pontiac Engine - Butler Performance pontiac 421 complete engine for sale | eBay Update your shipping location. The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. The V8 engine was introduced for the 1955 model year as the "Strato Streak". Power output ranged from 135hp (101kW) to 170hp (127kW). [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. 1965-75 Pontiac & Tempest Tune-up Specifications 1965 Pontiac Grand Prix with a 421 Tri-Power engine - YouTube Sponsored Stories . The 2-barrel version was last offered in 1979. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. pontiac timing ???????? | The H.A.M.B. 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. ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm It tips the scales at 3,950lbs. The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. 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 overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. The most famous S/D of them all. The Pontiac 2+2 was promoted as the "big brother" to the iconic Pontiac GTO. [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. 287. Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. 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. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. Chamber: Closed, special to PMD, 70 cc Email Email. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. Every torque specification should be in this table, however if there is one missing, please Contact Me and I will get you the spec and add it to the table. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. The 1971 Pontiac 455 HO was Pontiac's first engine to receive a special 800cuft/min (23m3/min) Rochester Quadra-jet carburetor with specific jetting. Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. 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. 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. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. 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 . The 389 was the standard engine on the GTO up to 1966. The earlier 1975-78 blocks had metal shaved from the journals and bottom end as well as a decrease in the nickel content of the block in an attempt to decrease the overall weight of the vehicle to help alleviate emissions and cost. It was the same engine as the '67-'68 400 HO[18] but for 1969 and 1970 it included a driver-selectable outside air induction system on the GTO(it was a separate option on Firebird), with the hood vents opened and closed using a knob located under the dash, below and to the right of the steering wheel, its bracket labeled "RAM AIR". Located at the back of the engine near the Distributor. In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). 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). Lift: 0.515/0.525 with 1.6:1 rockers Learn how Classified Ads works . Pre-Owned. 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. Thus in March 1973 Pontiac eliminated a timing solenoid that gave full vacuum advance and disabled the EGR valve in high gear after a period of time that happened to exceed the running time of the EPA testing cycle. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. In the 1968 Pontiac GTO it was given a 10.75:1 compression ratio and tuned to deliver 360 horsepower and 445 foot-pounds of torque.[2]. Manage Settings There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. Oil pan: 8-quart with extended pick-up, fabricated retention clamp From 1977 to 1981 there were 4 distinct 301 versions: For 1981 model year vehicles, the engine codes are the 8th digit of the VIN. The rod weighs 751 grams versus the stock rod at 958 grams. Pontiac had prepared for the forthcoming cancellation of the venerable 400 by producing large volumes of the stronger cast "XX" 400 blocks in 1977 that were assembled in 1978, and stockpiled at a warehouse by the assembly plant for later use. By 1963, the more powerful Pontiac 421 was beginning to outshine the 389 for performance applications. All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. 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. Six reasons to revere the 1966 Pontiac Grand Prix | Hemmings 1966 Pontiac Catalina 2-Door Sedan full range specs - Automobile-Catalog 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. Vacuum advance: Not usedEXHAUST The 428 was increased to 456.12cuin (7,474cc) in 1970. Seat pressure: 110 pounds at 1.600-in Though never factory-installed in any car, the ultimate engine of the Ram Air line of engines was the tunnel-port Ram Air V. In 1969 Pontiac created four versions of the Ram Air V engine: a 303cuin (5.0L) short deck version for SCCA Trans-Am racing, a 366cuin (6.0L) variant for NASCAR, a 400cuin (6.6L) version for street use in GTOs and Firebirds, as well as a 428cuin (7.0L) adaptation for drag racing. A total of 1,808 Ram Air IV production cars were built over its 2-year production. Make way for one of the baddest muscle cars of all time, the, An all-aluminum, race-proven V-8 defined the rare and wicked, The engine is what gives a muscle car its flamboyant personality. All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". Free local pickup. The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. 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. In 1977 the 400-cubic-inch (6.6L) T/A 6.6, (RPO code W72) was created to fulfil the performance engine gap in the Pontiac line-up. It was rated at 475hp (354kW). This same camshaft was also used in Pontiac's 19691970 RA IV production cars. Engines & Engine Parts for 1966 Pontiac GTO for sale | eBay Pontiac's SCCA Trans-Am program was promising, with race-ready engines producing 475hp (354kW) to 525hp (391kW), however the series General Competition Rules required the manufacturer to produce no less than 250 vehicles with the 303. Pontiac 421 Tribute to the legendary muscle car engine McKellar's Masterpiece: The Pontiac Overhead Cam 421 V8 [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).