Tri-Power equipped Pontiac hot roda stout piece by anyone's standards. Compression ratio was a modest 8.00:1, with valve diameters of 1.781in (45.2mm) (intake) and 1+12in (38mm) (exhaust). / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . The engine was available in all full-size Pontiacs. 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. Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust Preparation: Weigh, soap-and-water wash With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. All W72 equipped Trans Ams featured the "T/A 6.6" shaker decal. 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. The main upgrade for the engine was the ESC, (Electronic Spark Control)[15] which provided slightly more power at 170hp (127kW) with 4.9L (299cuin) for the 19801981 model years. Here is another number to ponder: 370 hp. These are general guidelines. High output Pontiac V8 Cylinder Heads. He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. It remained on the same platform, but for the 1966 models, it became a different Pontiac series. This was underrated at 330hp (246kW). Example: A128 = January 12, 19*8. Seat pressure: 110 pounds at 1.600-in 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. A panel covers the dash opening where the radio would have been on a standard Catalina. [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. The last was the 421 HO and included a high-output camshaft and valve train. Bore/Stroke ratio: 1.04:1 Only about 400 were produced before the fuel injection system was quietly dropped. 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). The premier SD 421 cylinder head was the late 1962-early 1963 casting #9771980 aka "980", featuring a larger 11.3cuin (185cc) intake port volume, flowing 230cuft/min (6.5m3/min) @ 28in (710mm). The company says engines running this cam benefit from headers, cylinder-head port work, a large-cfm carb, and an ignition upgrade. 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." The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. RamAir 4 Motor Price $15500.00. Thus, the quest to find 100 hp in a 421 started on the flow bench, before a wrench or machine tool touched any part of the 49-year-old engine. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. All 1977-1978 Trans Ams ordered with the 4-speed Borg Warner Super T-10 manual transmission received the W72 T/A 6.6 engine. The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. 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. The initial press cars that were given to the various enthusiast magazines (e.g. 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. He thinks the stock exhaust flow of 180 cfm will suffice for this build. 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. 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). Prices ranged from $2,760 to $3,220 . Pre-Owned. 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. Located at the back of the engine near the Distributor. Open pressure: 282 pounds at 1.100-in 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.. 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. Rear Main Cap. It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. Specifications listing with the performance factory . in. Pontiac produced the 421 V8 engine from 1961 to 1968. Pontiac V8 Engine Tune-Up and Torque Specifications. 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). The 421 was first availabe in a SD (Super Duty) model that was built for racing. The 2+2 option package arrived for 1965, giving the Catalina a performance persona and credentials to match. In 1967, the Pontiac 2+2 became an option on the . Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs Diameter: 516-in 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. 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 single four barrel was rated at 333 bhp while the Tri-Power version carried a 348 bhp rating. In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. 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 did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). Math, not gasoline, makes horsepower under the hood of a Pontiac. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block 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). 1969 - 400 Ram Air III or 350HO Code 48. 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. 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. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. In 1974 it was used in the GTO and was rated at 200hp (149kW) (net). The Block Date Code represents the production date of the engine. The 389 V8 was first introduced by Pontiac in 1959. engine, dual exhausts, three-speed manual transmission, Hurst shifter, 3.42:1 rear gears, heavy-duty suspension, bucket seats, upgraded upholstery, carpet, emblems, "Decor" louvers, pinstripes, lower . Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. Ever wonder what it would take to increase that number by 100? 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. 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. 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. 1966 Pontiac Catalina 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. Ellingson Motorcars (877) 638-7170. Using an equation the author has provided in HPP many timesmost recently with The Mule engine seriesit was revealed that around 228.6-cfm flow though the intake port of the cylinder head is required to produce the desired 470 hp. The Pontiac 2+2 was promoted as the "big brother" to the iconic Pontiac GTO. The 421 SD Tri . 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. [11] By mid-1978, the W72 could no longer be ordered in conjunction with the MX1 3-speed Turbo-Hydramatic 350 automatic transmission, and could only be ordered with the 4-speed manual transmission. #9770716 aka "716" heads featured a 170cc intake port volume, and were considered a milder "street" version of the vaunted SD421 Super Duty heads. The cylinder heads on the 400 CID version had an intake port volume of 290cc (17.70cuin), nearly twice the size of a typical standard D-port Pontiac head - and flowed in the area of 315cuft/min (8.9m3/min) @ 0.8in (20mm) valve lift; in the realm of the NASCAR-dominating Chrysler 426 Hemi. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. - P.B. which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. Ram Air induction was optional in the GTO, though power ratings were unchanged. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . Pontiac successfully competed against more-expensive inline four-cylinder models with their inline flathead six-cylinder engines. Returns; . Cam was a #541596 McKellar No. 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]. On this Wikipedia the language links are at the top of the page across from the article title. This was a completely stock car on loan from a private owner for the test. For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. 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. Two tri-power 421s were optional, one with 356 bhp, the other with 376. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. Neither casting was equipped with an exhaust crossover. 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. Pushrods: LPC chrome moly During 19511952, Pontiac had 23 287cuin (4.7L) V8-equipped 1953 model production prototypes running tests on the GM proving grounds. 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. 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]. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. The piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. The 1963 Catalina two-door sports sedan pictured here showcases the 421 H.O. Over the years he has amassed a library of data from investing in metallurgical testing with a well-respected laboratory. Duration at .050: 247/252-deg 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 This 356hp monster is backed by a 4-speed manual transmission, while the Pontiac also features power steering and power brakes. Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke Most Pontiac engines were painted light blue. 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). [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. 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. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. Lift: 0.515/0.525 with 1.6:1 rockers The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. 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. 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. "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. Lifters: Crower solid with EDM oil hole (0.024 inch) ][citation needed] T, While the exact total number of Ram Air V engines produced is not positively known, only about 25 303cuin (5.0L) engines were produced and about a dozen 428s and 366s. The crankshaft in the 428 had a "N" cast on them (designating nodular steel) as opposed to the 421's Armasteel. With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. The 428 was factory installed in large cars only. The shaker wore the decals "455 H.O." That's the factory rating of the legendary 421 H.O. Centerline: 110-deg 1966 Pontiac Catalina Specifications and Production. The very modest cam, combined with a low-compression ratio of 8.4 (advertised) and 7.9:1 actual resulted in 290hp (216kW) SAE NET. Most Pontiac engines like total timing (rev engine past 3000 or so until the mechanical advance stops moving/advancing, vacuum advance disconnected to check total timing) somewhere between 32 and 36 degrees. It had a four-barrel carburetor, dual exhaust, and higher compression, and was good for 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 - 1966 and the final year, 1967. 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.

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