guestion for gt40 heads

MustangGT92

New Member
Apr 13, 2006
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Oklahoma City
i was wondering how much of a difference a set of gt40 heads from a 95 cobra with 77,000 miles on it would give me over stock??? i'm mostly wondering about horsepower...:D

i have a 1992 mustang gt w/1:6 roller rockers, e303 cam, cobra upper and lower intake, 70mm throttle body, 73mm mas air calibrated for 24# injectors, 24# injectors, mac cold air, mac aluminum underdrive pulleys, 3:73 gears, mac shortie equal length headers, custom x-pipe w/ flowmasters thats dumped, short throw shifter:)
 
i got mine for 200. they need some work but when i'm done with them they'll be good to go.

with all the supporting mods you have so far, those heads should really wake the car up and be a blast to drive.

from what i gather, compression ratio will drop a bit, but that's perfect if you're plannin on some boost
 
Euphoric306 said:
i got mine for 200. they need some work but when i'm done with them they'll be good to go.

with all the supporting mods you have so far, those heads should really wake the car up and be a blast to drive.

from what i gather, compression ratio will drop a bit, but that's perfect if you're plannin on some boost


there are two diffrent combustion chamber for gt-40's 62.1cc's and 64.9ccs the 62's keep your cr stock (I am assuming we are talking about a 87-93 302 ho) and the 64's drop it a bit.