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Compression adds horsepower and torque throughout the entire RPM range and it can make a given engine seem larger at low speed and can make the camshaft seem larger at high speed. Some of Pontiac's best flowing and most capable D-port cylinder heads were produced during the 1970s. They are low compression castings, however, and have rather. The original 1970 Pontiac 455 'big block' V8 was good for between 360 and 370 horsepower and 500 lb-ft of torque. At first glance this didn't transcend the 370hp on offer by the Ram Air IV version of the 400 V8 available in the GTO that same year, or even Pontiac's 366 horsepower Ram Air III 400 motor. Part of the deficit was explained by the. Search: Best Heads For Pontiac 389. We install engines and transmissions and have been doing it for over 70 years Pontiac GTO as an example 75:1 compression ratio which produced 325 horsepower at 4600 rpm's Pontiac knew by 1979 the W72 the biggest and most potent new muscle car motor on the streets in the late-1970s was to be discontinued 389 V-8 - 2bbl - Hydra. Search: Pontiac 455 For Sale. Buick produced its 455-cubic-inch V-8 from 1970 to 1976 Can be used with Ram Air IV heads Pontiac 1973 The camshaft works well with high-performance's street applications, Performer RPM cams provide power from 1500 to OK Pontiac enthusiast, we are presenting an original 1970 Pontiac GTO Judge, with 58,000 original miles OK Pontiac enthusiast, we are presenting an. Pump gas, street-strip combos include 400-428-455 block, 92+ octane, hyd. roller or solid mechanical cam, AS SEEN IN The GTO Tiger! 10.80's @ 3700+lbs., street legal. We are also a finalist in the (PHR) Engine Master Challenge with one of. Hydraulic Flat Tappet Cam. High performance street/strip cam for 350 c.i. Excellent camshaft for 400-455 c.i. touring type vehicles with 9:1-9:5 compression ratio. Use 2200-2400 stall speed converter with 3.23-3.42 rear gears. Cam has a very noticeable idle quality!;.

If you like Pontiac’s the 400 engine bock is the way to go. This is one of Doug’s favorite builds. No stock rods in this engine we use only Eagle connecting rods. For a built proof bottom end, we also use a 1 pc rear main seal no oil leaks here. Give Steve a call and he will be happy to help design something just for you 800-267-3940.. a compression test wont confirm engine work that needs to be done. the size of the camshaft in relation to the compression ratio of the engine could very well create 110 psi in an otherwise healthy engine, with the only problem is that the cam is entirely too big. what you need is a cylinder leakdown test to tell you exactly what is wrong with it. Shop Pontiac Crate Engines and get Free Shipping on orders over $149 at Speedway Motors, the Racing and Rodding Specialists. ... Compression Ratio: 10.7:1 ... Solid Lifter Cam Kit for 305 Chevy SBC; Head Bolt Set for 305 Chevy SBC; Cylinder Heads for 305 Chevy SBC;. The applicable range in the hypothetical is 210-225; gearing and 4 speed allows for a higher duration so a cam with 220 to 225 intake duration should work pretty well. Note: the bigger the displacement the smoother the idle. Therefore, a 326 with a 220 intake cam will have a very lopey idle in contrast to the same grind working in a 455. A perfect cam for O.E. replacement and daily street driven vehicles These high torque cams work very well on the street. Made for use with engines having a 9:1 or less compression ratio. They can be used in conjunction with most stock components, including intake manifolds, exhaust manifolds, carburetors and will not affect any vacuum or power accessories such as power. 455ci/365hp. Zero to Sixty. 6.1 sec. Quarter Mile. 13.4 sec @ 102.0 mph. The 1971 GTO is distinguished by a hood featuring two large forward air intakes. Compared to the 1970 GTO, the 1971 GTO had a pretty modest face list; it featured wire-mesh grilles accompanied with horizontal bumper bars on each side and the headlamps stacked more closely.

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