1966 pontiac 421 engine specs

18 watchers Size cfm: Total flow, 1,050 cfm For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. 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. Your definitive 1964-67 Pontiac GTO buyer's guide - Hagerty 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. Detailed specs review of 1964 Pontiac Catalina Vista 421HO Trophy V-8 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 . By early 1979, orders for the W72 package were being rejected by dealers as they supply had run dry. He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. The 421 used the same 4.120-inch bore but used the 4.0-inch crank from the 421 it replaced. Note the tri-color Pontiac Ventura upholstery. 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 1975 455 HO package received some negative press/reviews as some buyers expected to see a return of the 1971-1972 engine, and were disappointed when they received the lower output motor. 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. 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 engine was first offered in 1967 as the top engine option in full-size Pontiacs. One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. 1963 Pontiac V8 Engine Specs. 093: 66 389 GTO: 65 . 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). This may have been propagated by the only authorized company that is licensed to reproduce these decals not including the "6.6 LITRE" in the Trans Am decal kits, and only including "T/A 6.6" with no extra cost. It included a new camshaft with duration increased from 288/302 (No. 5 January 2007. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. 301 Turbo (210hp, 157kW), (with the 5th VIN character being a "T". The engines feature a cast-iron block and head and two valves per cylinder. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. Pontiac offered this to the public as a streetable version of the 421 SD. 1962 Pontiac Catalina 421 Super Duty Royal Bobcat - Collector Car Ads Manage Settings 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. Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. 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. Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm Information and specs for the Pontiac 421 V8 engine. Lifters: Crower solid with EDM oil hole (0.024 inch) 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. 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. Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . The manuals had Hurst shifters. 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. These are general guidelines. Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. Pontiac Engine Torque Specifications Chart - RodsShop designs, the SD-455 was a much improved engine. Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. Preparation: Wash after balance for assembly The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. Pontiac V8 Engine Tune-Up and Torque Specifications. The piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. Returns; . Pontiac Engine Torque Specifications. 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). 4/21: Not just a date, but a legendary 421-cid Pontiac engine that One version of the engine featured camshafts driven off the front of the engine, another design had the cams driven by gears off the back of the engine. Ram Air induction was optionally available with the 455 HO in the Firebird Formula(standard on Trans Am), GTO (standard with "The Judge" package), and 2-door LeMans Sport when the T41 Endura Styling Option was also ordered. 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. Two-barrel carburetor, 8.5:1 compression, 227hp (169kW) @ 4600rpm, 333lbft (451Nm) @ 2300rpm, Four-barrel carburetor, 10:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Two-barrel carburetor, 10.0:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Four-barrel carburetor, 10.25:1 compression, 270hp (201kW) @ 4800rpm, 359lbft (487Nm) @ 2900rpm. 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. Rocker studs: ARP special 34-in bottom The horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. 1968 - 400 Ram Air II Round Port Code 96. Method used to retain pins in pistons: . 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. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. pontiac 421 complete engine for sale | eBay Royal Pontiac's engine swap wasn't a new trick for Pontiac. Along with a cam swap it boosted horsepower from 325 hp with the four-barrel carb to 348 hp in '64. They came up with a 269-cubic-inch (4.4L) L-head design. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Brand: Crower PN 60311, solid ARP - The Official Site | Pontiac Kits From a performance perspective, the 2+2 is pretty impressive. 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. 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. The camshaft was the HO cam with 288/301 duration. . 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. A History Lesson in Pontiac V8 Power - Engine Builder Magazine Price $14000.00. Horsepower: See Part 2 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. For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). [4] It was replaced by the 455 for the 1970 model year. [citation needed]. 1966 Pontiac Catalina The single four barrel was rated at 333 bhp while the Tri-Power version carried a 348 bhp rating. The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. Continue with Recommended Cookies. This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . Pontiac 2+2 - Wikipedia According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs Ellingson Motorcars (877) 638-7170. 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. Year. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. Rod/Stroke ratio: 1.65:1BOTTOM END 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. With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. One of the key upgrades were the 6x4 heads. 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. 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. This money bought a potent 389 V-8 with 267-283 bhp . 421 Tri-Power 4-Speed! 1966 Pontiac Ventura | Barn Finds 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. Free shipping on many items | Browse your favorite brands | affordable prices. A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. Buckets and a console were added to the top-line Catalina interior, which could be optioned with a sport steering wheel and instrumentation that included a tachometer and oil-pressure gauge. The 2-barrel version was last offered in 1979. Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? The 1970 '455 HO' was a conventional "D" port engine. These muscle car profiles include photos and specifications for each model: For related car information, go to these articles: Please copy/paste the following text to properly cite this HowStuffWorks.com article: the Auto Editors of Consumer Guide Rear Main Cap. (imp.) Modified versions of this engine were extensively used in NASCAR stock car racing and drag racing competition. That's the factory rating of the legendary 421 H.O. Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. This was the only Poncho with standard 421-cid power. McKellar's Masterpiece: The Pontiac Overhead Cam 421 V8 1966: 421: 9782611 (late) 1967-1969. Only about 2000 like this one were built with 4 speed Muncie transmissions. 1966 Pontiac 2+2 $64,995. Specifications listing with the performance factory . The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. 287. Transistorized ignition was available. Stock Pontiac Engine Specs - Ron's Pontiac Page Two tri-power 421s were optional, one with 356 bhp, the other with 376. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. 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]. Both Randy and Stan were aware of the . 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. For 1965, however, the 2+2 became a bonafide muscle car. (imp.) Read. [2] This was the engine installed in the Pontiac Executive line of large cars[3] and its largest station wagon, the Pontiac Safari. All 196869 #9792506 Ram Air 400 blocks have 4-bolt caps. In 1967, the cylinder head design was improved for the 400 4-barrel engine. 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. 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. 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. #9770716 aka "716" heads featured a 170cc intake port volume, and were considered a milder "street" version of the vaunted SD421 Super Duty heads. 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." While the 400 offered excellent power in the GTO (360 horses and 445 lb-ft of torque in 1968), Pontiac turned to what it called 'big journal' engines for the muscle machine's next upgrade. The external dimensions of all their V8s, from 326455cuin (5.37.5L) were the same. This was based on results of over 1 million test miles, which was unheard of at the time. Pontiac V8 Engine Tune Up and Torque Specifications - WOW Muscle Cars 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. 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). Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. 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). The Ram Air IV heads had 1/8" taller intake ports, larger intake port volume with more airflow, yet shared the Ram Air II round exhaust ports. In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). The Pontiac Engine - Butler Performance 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 engines feature a cast-iron block and head and two valves per cylinder. All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. 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). The other major difference between the "typical" Pontiac engine of the time was that this one used the large . Though production cars only got the two hood air inlets the name was retained. A limited-slip differential and gearing up to 4:11.1 were optional. 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. This was underrated at 330hp (246kW). The 455 HO moniker was again carried over, this time as a near-exact repeat of the 1971 offering, the only changes were the carburetors (they used a conventional 750cuft/min (21m3/min) unit this year), and the head castings (casting #7F6). A common misconception made by enthusiasts was the notion that all Pontiac engine equipped Trans Ams featured the "T/A 6.6" decal on the shaker, however, it was exclusive to the W72 engine that was featured on less than half of all Trans Ams made during this period. Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). An evolution of the RA IV and H.O. Also bowing in 1967 was the new Firebird, which had the . Casting No. Retainers: Crower steel 1966 Pontiac 2+2 Convertible 1966 Pontiac 2+2 Convertible The 428 was factory installed in large cars only. See profiles, photos, and specifications of, Muscle cars came in many shapes and sizes. 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. The shaker wore the decals "455 H.O." There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. 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. It featured 3+14in (82.6mm) main journals (which the legendary Smokey Yunick reputedly left Pontiac's engineering department over). 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. Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. Also, a rumored 75 cars were built with non-Super Duty 421 engines rated at 320 bhp. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). The consent submitted will only be used for data processing originating from this website. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. Once corrected the SD-455 was recertified and was released for production in late April 1973. In 1963 Pontiac dropped the Buick division built 215 cu. 1966 Pontiac 2+2 421 H.O. Tri Power 376 horsepower 1966 Pontiac Catalina . Only about 400 were produced before the fuel injection system was quietly dropped. - P.Top - Correct Exterior/Interior. For 1956 the V8 was bored out to 3.9375in (100.01mm), increasing displacement to 316.6cuin (5.2L). The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. Vacuum advance: Not usedEXHAUST 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. 1966 Pontiac Gto Glendale, Arizona | Hemmings Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). Brand: Fel-Pro head and intake/ SCE pan and timing cover 1965 Pontiac LeMans GTO Mecum. 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. Engine Oil: 95 ft-lbs. This was the last run for the 455 (7.5 L) motor from Pontiac, and production ceased on the 455 this year as it could no longer meet the emissions requirements any longer. Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. 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). 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. Wires: NAPA Belden 7 mm Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. The initial press cars that were given to the various enthusiast magazines (e.g. The 1963 Catalina two-door sports sedan pictured here showcases the 421 H.O. The 428 was increased to 456.12cuin (7,474cc) in 1970. The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. Over the years he has amassed a library of data from investing in metallurgical testing with a well-respected laboratory. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. Some 400s were dealer installed. Prices ranged from $2,760 to $3,220 . 1962 421 super duty motor Price $30000.00. 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, They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. 1966 Pontiac Catalina technical and mechanical specifications The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. Pontiac 421 Tribute to the legendary muscle car engine Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. 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. Although it is much different from the original 1955-vintage Pontiac V-8 powerplant, the 301 has the distinction of being the last true Pontiac V-8 engine, as Pontiac ceased production of these engines effective April 1, 1981. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. On this Wikipedia the language links are at the top of the page across from the article title. This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. 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. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. A total of 1,808 Ram Air IV production cars were built over its 2-year production. Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac. The 389 was the standard engine on the GTO up to 1966. - P.B. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. 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. It used the "744" camshaft (301-313) in the earlier manual trans versions, later downgraded to the "068" version, and the 288/302 duration cam with automatic transmission. Today, they have an average value of $430,000 in #3 (Good) condition, while the best in the world is worth about $550,000. 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. By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly.

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