1983 Mustang G.T. Supercharging GT40p heads | Modded Mustang Forums I'd get the gt40 setup, and put an s trim on it. Go for it if you get them super cheap and can get headers/manifolds super cheap as well but otherwise I'd say it's a waste of time and money. GT40 Heads On A 289? | Ford Muscle Cars Tech Forum Richard Rowe has been writing professionally since 2007, specializing in automotive topics. Stock Ford 351W 4bbl dyno numbers - Don Terrill's Speed-Talk I have been working on Fords for 40 years and I have experimented with a few tricks of my own. I added a link to it. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. $139.99. GT40P heads, what kind of performance do they give? Just got through porting one of my gt40p heads today. Dec 8, 2011. Dyno results GT40P heads | Vintage Mustang Forums These are some of the pictures I have showing the Explorer manifolds. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Actually the regular gt40's in either aluminum or iron are the good ones but the gt40p's are only a slight improvement over regular 302 heads. Its NA but makes use of AFR heads and some other aftermarket goodies. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. Add 40 to 70 HP to your 302 yourself - Factory Five Racing Forum Step 1. Assuming this will be a daily driver engine, a short duration camshaft, especially when combined with a four-barrel dual plane intake manifold and headers, will deliver extremely snappy throttle response and the whole combination will increase the torque and peak horsepower by somewhere in the neighborhood of 20 to perhaps 35 horsepower. In less than an hour, we were ready to test. I must agree with Jeff Smith. You need to check. Well also assume that this engine is running stock exhaust manifolds. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. For a better experience, please enable JavaScript in your browser before proceeding. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. But dont think that adding a bigger camshaft will make more power. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. Even with a stock Mustang 5.0 cam makes good power. It took him and yours truly eight hours from start to finish, using air tools and a lift to gain access to the header flanges. 1983 Mustang G.T. GT40, GT40P, would be great factory heads. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. i know a guy who used to build race engines so he has all the right tools, how much would it help to get the heads ported and polished or anything else he could do to them.

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