In 1967, the cylinder head design was improved for the 400 4-barrel engine. Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. Preparation: File-fit for end gap if needed, wash Most Pontiac engines were painted light blue. 1967 was the last year for closed-chambered heads. Installed position: 110-deg The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. Save pontiac 421 complete engine to get e-mail alerts and updates on your eBay Feed. By 1979, Pontiac was no longer allowed to produce the 400 engine as emissions further tightened. Though production cars only got the two hood air inlets the name was retained. [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. A period-correct battery cranks the high-compression 469-cubic-inch Pontiac engine. Email Email. Update your shipping location. engine for 1963 is reported to be putting out 500 ft-lbs torque at 4,200 rpm and . The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. 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. in. With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. The valve angle was reduced from 17 degrees to 14 degrees for better breathing. All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. Despite their work, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 until later in the 1950s. The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. A camshaft with 301/313 degrees of advertised duration, 0.407-inch (10.3mm) net valve lift, and 76 degrees of valve overlap was specified for actual production engines in lieu of the significantly more aggressive Ram Air IV-spec camshaft that had originally been planned for the engine (initially rated at 310hp (231kW) with that cam), but ultimately proved incapable of meeting the tightening emissions standards of the era with sufficient margin to satisfy Pontiac emission engineers given expected volume production variations. The rod weighs 751 grams versus the stock rod at 958 grams. 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 . Prices ranged from $2,760 to $3,220 . According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. 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. Pontiac . Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. 1966 Pontiac Catalina Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. Preparation: Install in rod, torque, measure ID 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. 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. The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. Primary tube length: approximately 31.00 inches Available only in the 1973 and 1974 Firebird Formula and Trans Am, the SD-455 consisted of a strengthened cylinder block that included 4-bolt main bearings and additional material in various locations for improved strength. With A/C On, Engine Hot: 421: 1966: With Tri-Carb, With Air Injection reactor: 45S: 0.035: Both Randy and Stan were aware of the . 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). An example of data being processed may be a unique identifier stored in a cookie. 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. 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. 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Tri-Power equipped Pontiac hot roda stout piece by anyone's standards. Pre-Owned. For 1967 only Pontiac called this engine the Quadra-Power 428. Math, not gasoline, makes horsepower under the hood of a Pontiac. Price $15500.00. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. in. designs, the SD-455 was a much improved engine. Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . Modified versions of this engine were extensively used in NASCAR stock car racing and drag racing competition. Valve seals: U.S. Seal Pushrods: LPC chrome moly Model Number: Body/Style Number: Body Type & Seating: Factory Price: . 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 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. Engine displacement is a function of bore and stroke. moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". Two different cylinder-head castings were used for the 1962 model year, both with a combustion chamber volume of 68cc (4.15cuin) to produce an 11.0:1 compression ratio. The 301.6cuin (4.9L) 301 was offered from 1977 to 1981 and also installed in other GM cars during those years. Pontiac produced the 421 V8 engine from 1961 to 1968. The shaker wore the decals "455 H.O." The GTO came with a four-barrel 389 V8 with 335 horsepower. Lobe separation angle: 112-deg Preparation: Wash after balance for assembly The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. 1966 Pontiac Catalina Specifications and Production. It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. Unique exterior features included "2+2" badges, twin lens taillamps, and chrome bodyside gills; Pontiac's famous eight-lug aluminum wheels were the ultimate optional touch. Fuel pump: Will use 110-gph Carter The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. And it cruised silently and rode with less harshness than muscle intermediates. The Block Date Code represents the production date of the engine. Rear Main Cap. 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). There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. We and our partners use cookies to Store and/or access information on a device. However, the RA II was limited to a 1.50:1 rocker ratio, while the RA IV used a 1.65:1 ratio, which yielded significantly greater total lift and, therefore, superior flow and power. Optional was the obligatory four-speed manual or new-for-1965 Turbo-Hyramatic three-speed automatic. This was a completely stock car on loan from a private owner for the test. Information and specs for the Pontiac 421 V8 engine. 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. Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac. Primary tube diameter: 1.75-in 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. 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. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). Only about 2000 like this one were built with 4 speed Muncie transmissions. Oil pan: 8-quart with extended pick-up, fabricated retention clamp 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. 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. Required airflow at 28 in/H2O = HP/ # of cylinders/0.257 301 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). The goal of making a Pontiac Hemi succeeded but the engine was never produced. Only one is known to survive today. Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. The engines feature a cast-iron block and head and two valves per cylinder. It was rated at 475hp (354kW). Valve guides: K-Line, liners Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor 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). . See profiles, photos, and specifications of, Muscle cars came in many shapes and sizes. Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . street engine. 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. As a result, peak horsepower dropped from 310 to 290, though torque increased from 390 to 395lb. The code consists of 3 or 4 digits. 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. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. Intake manifold: Original '64 PMD tri-power 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. Chamber: Closed, special to PMD, 70 cc PONTIAC : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . 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). 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. By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly. 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. Manage Settings of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. Valvesprings: Crower, dual no damper It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. 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. [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). Deck Height: 10.215-in "Armasteel" was a trademark of pearlitic malleable iron developed by GM's Saginaw Metal Casting Operations around 1936, which was referred to as "locking ball" cast-iron, as opposed to the "flaking" type found in other engines. It was rated at 366bhp (273kW) (gross) in the GTO version. They came up with a 269-cubic-inch (4.4L) L-head design. The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). [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. Maximum flow at 28 inches of water 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. An HO version could be ordered in the GTO, as GM had lifted its restrictions on offering engines larger than 400cuin (6.6L) in mid-sized cars (resulting in the 454 (7.44) Chevrolet Chevelle, Pontiac offered this to the public as a streetable version of the 421 SD. All 196869 #9792506 Ram Air 400 blocks have 4-bolt caps. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". Engine Block Date Code. Diameter: 516-in In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. In 1973 a further refined and even stronger but less powerful version, the Super Duty (SD) engine, was planned for Firebird, Grand Am, Le Mans (GTO), and Grand Prix models. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. 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. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. A higher-output version was offered, called the 326 HO (High Output). It could only be ordered with a TH200 automatic transmission and a 2bbl configuration. Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. By comparison, the factory 421 H.O. [22]. The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. The 421 also marked the end of the option for a forged-steel crankshaft. This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . Year. 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. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. Over the years he has amassed a library of data from investing in metallurgical testing with a well-respected laboratory. 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. 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 L75 455 engine continued as an option into the 1976 model year for the Trans Am, however, Pontiac opted to drop the "H.O." They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. These same heads were also used on the 1964 GTO 389 tri-power engines. #9770716 aka "716" heads featured a 170cc intake port volume, and were considered a milder "street" version of the vaunted SD421 Super Duty heads. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. Valves: Competition Products stainless steel, 1.92 /1.66-in 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. The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. 1969 - 400 Ram Air III Code 62. Jim Taylor, well-known Pontiac engine builder, had that question on his bucket list for years. Shipping to: 98837. First offered as an option in 1963, the 421 HO came in a 4-barrel engine of 320hp (239kW) and one Tri-Power H-O version with a hotter cam and efficient iron exhaust manifolds and rated at 370hp (276kW). After outselling Oakland, Pontiac became the sole survivor of the two by 1932. Balancer: Original PMD rebuilt by Damper Doctor The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. Open pressure: 282 pounds at 1.100-in 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. The 389 was the standard engine on the GTO up to 1966. The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. 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. Along with proper parts selection, accurate machining and assembly are also important. It was renamed 428 HO for 1968. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. Example: A128 = January 12, 19*8. It also could hold its own against a range of performance cars. Final torque ratings may vary and need to be determined based on application and parts used. Secondary: Front and rear #70 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]. 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). The 421 engine is available only with related heavy-duty driveline components. There was also the addition of dual exhaust, and for vehicles equipped with a manual transmission, a slightly more aggressive camshaft. It was factory rated at 366hp at 5,400 RPM and 445lbs.ft. Wires: NAPA Belden 7 mm 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. During 19511952, Pontiac had 23 287cuin (4.7L) V8-equipped 1953 model production prototypes running tests on the GM proving grounds. The company says engines running this cam benefit from headers, cylinder-head port work, a large-cfm carb, and an ignition upgrade. 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. 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. Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . (imp.) 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: 421: 9782611 (late) 1967-1969. Styling for Status. It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. The consent submitted will only be used for data processing originating from this website. Whether all were installed in GTOs is unknown. This is it! 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 called the Ram Air IV due to the planned use of four air inlets. Mods: Intake port match, valve bowl blend, improved short-turn radius Block description: '64 421ci #157 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. Here is another number to ponder: 370 hp. However, compression ratios were cut dramatically, marking the beginning of the end of the muscle car era. ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm The "670" head was a 1967-only casting, and the only PMD head to have a closed chamber with the new 14 degree valve angle. for 1980, and the 8th being a "T" for 1981). All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. If you enjoy the videos and would like to Sponsor me on Patreon, my Creator link is "My Car Story" we're in Huntl. 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. (imp.) (V8) - Stamped on right front side of block or beneath production . Not long before the model year introduction, Pontiac management decided that the entire line would be V8-powered. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. As a result, it was remarkably free of teething problems. 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. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. 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. True Pontiac engines were designed and built in Detroitnot on a computer, but often by GI-bill-educated engineers who grew up working with their hands and now had a slide rule in their pocket instead of a greasy rag. 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. The 1970 '455 HO' was a conventional "D" port engine. It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. 1966 Pontiac Catalina technical specifications and data. 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 fuel-injected engine became an option on any Pontiac model, carrying a staggering price tag of $500 (almost 15% of the car's base price). Bore/Stroke ratio: 1.04:1 While not related to the 400 W72, the concept was the same. 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. If you've been thinking about cruising the local boulevard in a classy convertible, but find yourself longing for the power under the hood that only a muscle car provides, perhaps it's time to take another long look at Pontiac's restyled 1965 Bonneville convertible.
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