The basic package included the heavy-duty suspension, with even stiffer springs and shocks available. 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. This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. 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). 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. (imp.) Ram Air induction was optional in the GTO, though power ratings were unchanged. The engine compartment of this concours Catalina is beautifully finished. It's well documented that an internal combustion engine is nothing more than an air pump. 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. [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).
Pontiac V8 Cylinder Heads - Wallace Racing .
1966 Pontiac Catalina technical and mechanical specifications Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. In 1974 it was used in the GTO and was rated at 200hp (149kW) (net).
1963 Pontiac Super Duty 421: A Profile of a Muscle Car - HowStuffWorks / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! Secondary: Front and rear #70 The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. The goal of making a Pontiac Hemi succeeded but the engine was never produced. 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. Valve guides: K-Line, liners In 1967, the Pontiac 2+2 became an option on the . 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. Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. Based in part on designs for the "short deck" 303cuin (5.0L) engine designed for the 1970 racing season, it had a shorter deck than the big V8, and used thin-wall castings to reduce weight. Oil pan: 8-quart with extended pick-up, fabricated retention clamp of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. 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. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). 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. 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. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. 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. 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. The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. 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. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . 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. 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. A panel covers the dash opening where the radio would have been on a standard Catalina. The 421 used the same 4.120-inch bore but used the 4.0-inch crank from the 421 it replaced. The Ram Air II also incorporated the first computer-designed camshaft. On the invoicing for the 1979 model year Firebirds, they had the option listed as L78, however, every 1979 400 equipped car received a W72 engine. gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS ( SAE gross . At the end of 1976, Pontiac was no longer able to continue production of the 455 (7.5 L) V8 motor due to the tightening emissions requirements. 3.75. This had extra-rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit to allow the Power Enrichment Vacuum Regulator (PEVR) to release the primary metering rods to move to the up position (enrichment) anytime during boosted conditions. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. A 400 cubic inch ram air equipped V8, it was an option on the 1969-70 GTO and Firebird Formula. 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 next 1 or 2 numbers represent the date, and the last number is the year.
1965 Pontiac Bonneville Convertible | Hemmings 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. 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. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust [5] It was rated at 360hp (268kW), but the Grand Prix with the same specifications was rated at 370hp (276kW).[6]. The four-barrel version, set up for sustained high speeds, had 390 hp. Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. By 1963, the more powerful Pontiac 421 was beginning to outshine the 389 for performance applications. Tri-power engine rated at 376 hp. 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. Stock Pontiac Engine Specs. The GTO came with a four-barrel 389 V8 with 335 horsepower. . Open pressure: 282 pounds at 1.100-in It was factory rated at 366hp at 5,400 RPM and 445lbs.ft. 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. (imp.) Rod/Stroke ratio: 1.65:1BOTTOM END 1967 was the last year for closed-chambered heads. A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. 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. 301 Turbo (210hp, 157kW), (with the 5th VIN character being a "T". This is it! The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. These are general guidelines.
1966 Pontiac Ventura / Photos, Specs, Design - Auto Museum Online 1966 Pontiac Gto Glendale, Arizona | Hemmings 1966 Pontiac Grand Prix - conceptcarz.com Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). Power ratings increased accordingly: Several dealer-installed camshafts were optional to increase power further to 317hp (236kW).
1966 Pontiac Bonneville Convertible full range specs - Automobile-Catalog The Pontiac 2+2 featured a 6.9 L V8 engine, heavy-duty front springs, dual exhaust and distinctive exterior body design. With A/C On, Engine Hot: 421: 1966: With Tri-Carb, With Air Injection reactor: 45S: 0.035: In 1967, the cylinder head design was improved for the 400 4-barrel engine. street engine. 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. Valve seals: U.S. Seal 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 . Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. Spiral clip aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. Casting number: 97770716, '64 date The Fresh Air package continued into the 1966 model year. Valves: Competition Products stainless steel, 1.92 /1.66-in Intake manifold: Original '64 PMD tri-power Detroit, however, was reluctant to relinquish its time-tested biggest-car/best-engine formula. The V8 engine was introduced for the 1955 model year as the "Strato Streak". This installment includes the assembly and parts selection up to the long-block. It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression.
Pontiac V8 Cylinder Heads - Casting numbers and Specs - WOW Muscle Cars Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. 1966 Pontiac 2+2 $64,995. Preparation: Disassemble, check ball seat for width, spring tension, plate clearanceHEADS
Projects - 1964 PONTIAC 421 HO Engine Build | The H.A.M.B. Upon reflection, many did not consider that it was the only large displacement engine still on offer for any performance car on the market, and reconsidered Pontiac's position between the rising CAFE emissions restrictions.[14].
1966 Pontiac 2+2 421 H.O. Tri Power 376 horsepower Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. The engine build will be discussed in two parts. There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm Model Number: Body/Style Number: Body Type & Seating: Factory Price: . Pushrods: LPC chrome moly 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. Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. in. Here are my top six rationales for admiring the 1966 GP. 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. Keepers: Comp Cams race locks This money bought a potent 389 V-8 with 267-283 bhp . 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. Some production test cars ran considerably slower and yielded 14-mile (402m) times in the 14.5 second/98mph (158km/h) range in showroom tune (uncited sources)- results that are quite consistent for a car with a curb weight of 3,850 pounds (1,746kg) and the rated 290hp (216kW) SAE NET figure that some sources suggest was "under-rated."