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. 4/21: Not just a date, but a legendary 421-cid Pontiac engine that Beep, beep! 389 Pontiac Engine Build - Restore An Old Car 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. 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. All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. 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. Crank: Original '64 421 Power output ranged from 135hp (101kW) to 170hp (127kW). Pontiac 389 Engine Guide - Muscle Car Club 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). Coil: GM 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. 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]. 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. 421 Tri-Power 4-Speed! 1966 Pontiac Ventura | Barn Finds Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor . With some WS6 "Trans Am Special Performance Package" bundles in 1978, the W72 engine was incorporated with the WS6 option group and not listed on the dealer order invoice. With the 1964-1967 Pontiac Catalina 2+2, Pontiac achieved a combination of power, road-holding, and fine styling superior to any other big Pontiac, and most of the competition's models besides. Size cfm: Total flow, 1,050 cfm Though airflow is paramount in making power, there are other aspects of the engine that are just as important. The 1981 301 Turbo gained the electronic controls with an O2 sensor, feedback ECM and E4ME Quadrajet providing a slight reduction in output to 205hp (153kW) and 340lbft (461Nm).The 301 Turbo was limited to Trans Am and Formula Firebird production only. 744) and a new valve spring package with dampers to positively control valve action. What is important is the total timing, the . Tested: 1968 Pontiac GTO 428 / Royal Bobcat - Car and Driver The Pontiac 2+2 featured a 6.9 L V8 engine, heavy-duty front springs, dual exhaust and distinctive exterior body design. Engine Specifications. Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. Stock Pontiac Head Specs - Ron's Pontiac Page This is it! 1963 Pontiac V8 Engine Specs. For 1971, Pontiac introduced another High Output (HO) version with standard internal parts, a reinforced block with four-bolt main bearing caps, and improved cylinder head design with 18-inch taller (3.2mm) intake ports and special round exhaust ports for better breathing, yet still making just 335hp (250kW) gross (or 310hp (231kW) in the more accurate SAE Net system). For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. A History Lesson in Pontiac V8 Power - Engine Builder Magazine Building a rare Pontiac Catalina Royal Bobcat piece by piece 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. 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. Cougar pulled out of Mustang's shadow with the striped and spoilered 1969 Mercury Cougar Eliminator. The goal of making a Pontiac Hemi succeeded but the engine was never produced. An example of data being processed may be a unique identifier stored in a cookie. Pontiac went to open-chambered heads in some 1967 models and all 68 and up to improve power, engine breathing and reduce emissions. Distributor: '61 Delco cast-iron with direct oiling This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. Most likely prompted by its development of the Pontiac OHC six, the GM division built three different experimental SOHC 421 CID V8 engines in the early 1960s. Hewing to GM's standing edict limiting engine size to 400 cu in for its midsize and smaller cars, the 360hp (268kW) (underrated),[citation needed] the 400 cubic inch Ram Air V-8 was the most powerful and advanced option available in the 1967 GTO and Firebird. Information and specs for the Pontiac 421 V8 engine. 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. Pontiac Blocks Casting Information - Butler Performance It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Continue with Recommended Cookies. SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. Royal Pontiac developed the prototype of the package on their 1965 GTO drag car and Pontiac picked up the idea and in August 1965 Pontiac offered the new Fresh Air package to dealers consisting of the parts and instructions needed to make the hood scoop functional, including the metal tub to mount to the carburetors and rubber gasket to seal it to the underside of the hood. Neither casting was equipped with an exhaust crossover. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. . Simply put, what good is the power if the engine does not last? Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. For 1969-1970 GTO the 400 HO included driver operable Ram Air induction and was renamed "400 Ram Air" for 1969 and just "Ram Air" for 1970. Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! 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. Open pressure: 282 pounds at 1.100-in 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. Intake manifold: Original '64 PMD tri-power 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. and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). 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 455 HO designation made its debut in 1970; Rated at 360 or 370hp (268 or 276kW) (depending on which vehicle it was installed into) & 500lbft (678Nm) of torque, it differed from the regular full sized car 455 by large valve heads with smaller combustion chambers, and a larger camshaft. Often called the "Ram Air III", this engine was officially called the "400 Ram Air" for 1969 and then simply "Ram Air" for the 1970 model year. 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. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. "1966 Pontiac 2+2" in. All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. Pontiac offered this to the public as a streetable version of the 421 SD. 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 engines feature a cast-iron block and head and two valves per cylinder. [19], Parts for Ram Air V engines are not readily available. Pontiac successfully competed against more-expensive inline four-cylinder models with their inline flathead six-cylinder engines. Spiral clip The short-deck block and different intake ports also required the design of a new intake manifold. Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. Where else will the extra 100 horses come from? . 1965-'66 Pontiac Catalina 2+2 | Hemmings 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. Initial advance: 18-deg The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. Wearing a revised GM B-body semi-fastback shape, the 2+2 option delivered a 421-cu.in. RamAir 4 Motor Price $15500.00. Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke The shaker wore the decals "455 H.O." 1966 Pontiac GTO. The 1970 '455 HO' was a conventional "D" port engine. A period-correct battery cranks the high-compression 469-cubic-inch Pontiac engine. 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? Lifters: Crower solid with EDM oil hole (0.024 inch) 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). Here is another number to ponder: 370 hp. Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. In 1967, the Pontiac 2+2 became an option on the . 1965 Pontiac Grand Prix with a 421 Tri-Power engine - YouTube It tips the scales at 3,950lbs. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . Brand: Fel-Pro head and intake/ SCE pan and timing cover Casting number: 97770716, '64 date Pontiac V8 Cylinder Heads - Casting numbers and Specs - WOW Muscle Cars 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . The valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. This was the only Poncho with standard 421-cid power. 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. Preparation: File-fit for end gap if needed, wash The single four barrel was rated at 333 bhp while the Tri-Power version carried a 348 bhp rating. This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . For 1970 the Trans Am was the only Firebird available with the Ram Air IV, and 88 were produced during the abbreviated 1970 F-body production run. Total Timing: 36-deg BTDC Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. 1967 was the last year for closed-chambered heads. Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. It added '421' engine badges on the front fenders, 2+2 insignia on the deck lid and rear fenders, and simulated louvers behind the front wheel cutouts. Engines & Engine Parts for 1966 Pontiac GTO for sale | eBay Primary tube length: approximately 31.00 inches The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. NASCAR race cars embody the muscle car philosophy of power. The 421 badging was standard on the 2+2, the 421 H.O. In the Firebird Ram Air induction for the 400 HO was a separate option for 1969(included with Trans Am) and included with the engine(optional in Formula; included with Trans Am) in 1970. 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]. 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.Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. The valve angle was reduced from 17 degrees to 14 degrees for better breathing. A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. Two tri-power 421s were optional, one with 356 bhp, the other with 376. There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. Regarding Crower's upgrade suggestions for its camshaft, Jim pretty much has it covered. The main innovation of the Pontiac engine was reverse-flow cooling and the stamped rocker-arm system, which had been devised by Pontiac engineer Clayton Leach in 1948. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. 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 piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. 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. Pontiac ignited the classic muscle car era with a stroke of marketing genius. Here are features on more than 100, Muscle cars created their own culture. Prices ranged from $2,760 to $3,220 . 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. 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). 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. 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. 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. Tri-Power equipped Pontiac hot roda stout piece by anyone's standards. 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]. The four-barrel version, set up for sustained high speeds, had 390 hp. By comparison, the factory 421 H.O. Royal Pontiac's engine swap wasn't a new trick for Pontiac. From 1955 through 1959, the Pontiac V8 was also used in some GMC pick-up trucks. The L75 455 engine continued as an option into the 1976 model year for the Trans Am, however, Pontiac opted to drop the "H.O." The heads were a new design featuring siamesed intake ports. 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. 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. Pushrods: LPC chrome moly Though production cars only got the two hood air inlets the name was retained. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). Pontiac engineers tested their 269cuin (4.4L) V8 in 1949 or 1950 against an OHV Oldsmobile Rocket V8 303cuin (5.0L) downsized to 270cuin (4.4L). Pontiac began as a "companion make" to the Oakland division of the General Motors line of automobiles in 1926. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. ARP - The Official Site | Pontiac Kits 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. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. 1966 Pontiac Gto Glendale, Arizona | Hemmings Over the years he has amassed a library of data from investing in metallurgical testing with a well-respected laboratory. The 1972 455 HO was available in the Firebird (optional in Formula; standard in Trans Am) and 2-door LeMans (including those with the GTO option) and LeMans Sport convertible. / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. Styling for Status. For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). The stroke increased to 4.21-inch (106.9mm). The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. 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 389 would remain the standard Pontiac V8 engine through 1966, offered in a bewildering variety of outputs ranging from 215 to 368hp (160 to 274kW). Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? These heads can be distinguished from 6x8 heads through a small stamped "4" on the top of the front boss. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. Engine Oil: 95 ft-lbs. Valve guides: K-Line, liners gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS . Pontiac Grand Prix - Muscle Car Club The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. Read. Tri Power engine however was optional. Pontiac Engine Torque Specifications Chart - RodsShop The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. 1966 Pontiac 2+2 for sale near Rogers, Minnesota 55374 - Classics on ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . Boost was wastegate limited to 91psi (0.6210.069bar). Timing chain: LPC, double rollerINDUCTION The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. It was rated at 366bhp (273kW) (gross) in the GTO version. designs, the SD-455 was a much improved engine. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Pontiac V8 Engine - The engine that sparked the Muscle Car Era Tri-power engine rated at 376 hp. This new material had stronger alloys in the iron. As Pontiac's 1967 performance brochure said, "You can add the Ram Air induction hood scoop and new high output cam and valve springs to the Quadra-Power 400 for better top end breathing." Year: CU IN: Casting # 1967: 326. 1966 Pontiac Catalina - Oldride 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. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. For 1965, however, the 2+2 became a bonafide muscle car. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. Head ID Location 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). By 1979, Pontiac was no longer allowed to produce the 400 engine as emissions further tightened. When Robert Critchfield took over as general manager in 1952, he launched an ambitious plan to move Pontiac into the upscale, mid-range market occupied by Oldsmobile, and that demanded V8 power. The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. Ever wonder what it would take to increase that number by 100? In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. Rocker studs: ARP special 34-in bottom 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". Along with a cam swap it boosted horsepower from 325 hp with the four-barrel carb to 348 hp in '64. Email Email. Engine Oil: 120 ft-lbs. 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. Valvesprings: Crower, dual no damper Both used a single two-barrel carburetor. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. 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. ENGINE. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. Stock Pontiac Engine Specs - Ron's Pontiac Page Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. The 1963 Catalina two-door sports sedan pictured here showcases the 421 H.O. Pontiac V8 Engine Tune Up Specifications. This test would tend to lend credence to the CAR AND DRIVER and HOT ROD tests of 1973 Super Duty cars with 3.42 gears, no air, and 160lb (73kg) less weight as being representative of production specimens capable of mid to high 13-second passes at 104mph (167km/h). It was rated 180hp (134kW) @ 4600rpm and 264lbft (358Nm) @ 2400rpm with a two-barrel carburetor, 200hp (149kW) @ 4600rpm and 278lbft (377Nm) @ 2800rpm with the four-barrel carburetor. Along with proper parts selection, accurate machining and assembly are also important Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 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). 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. 301 Turbo (210hp, 157kW), (with the 5th VIN character being a "T". SELLER Glendale, Arizona 85305. Not where most enthusiasts go first. The horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. 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. Both Randy and Stan were aware of the . Keepers: Comp Cams race locks Pontiac 421 V8 Specs, Firing Order and Engine Information - Engine Facts 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. A higher-output version was offered, called the 326 HO (High Output). These motors were built mainly for NASCAR or other racing purposes and were equipped with all the extra racing goodies that people were looking for. The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. 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 . 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). Reductions in reciprocating weight free up horsepower. Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. Piston-to-deck height: 0.009-in 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.
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