hi, i have been looking for some heads for a little while now, and i have found several but i dont know how to interprate the numbers im being given. what am i looking for in a good flowing head? also, i have 2 options on my plate as of now, a set of ported and polished factory heads, or a set of GT40P heads. will the gt40's outflow a set of ported and polished factory heads, i beleive E7's.
also here is a quick quote from the description, what do these numbers mean to me??
White 1991 GT Convertible - 1993 Cobra Motor Swap (363rwhp)
Black 2004 SVT Cobra - Chip n Tune w/ Goodies (488rwhp)
Green 1994 Explorer - Daily Driver, Ol' Faithful (317,000mi)
GT40 p's are cast, but still are better than the E7's. As for the 60 cc = chamber volume, 2.05 is the intake valve size/ 1.6 exhaust size. 210 should be intake runner volume, check to make sure they are not X castings or Y castings if they are alluminum.
I would try to find a head that has 64 cc chambers, 1.94 intake/1.6 exhaust for a street driver. Yes alluminum transfers heat better and you ussually can run alittle more timing without detenation.
the heads i found are the gt40's but the info i quoted where just random heads i found just as an example, the heads i am going to buy are cast. ill post a link below to the ebay auction.. thanks for the info on all the numbers tho!!!
White 1991 GT Convertible - 1993 Cobra Motor Swap (363rwhp)
Black 2004 SVT Cobra - Chip n Tune w/ Goodies (488rwhp)
Green 1994 Explorer - Daily Driver, Ol' Faithful (317,000mi)
hey, i know this is a bit offtopic, but i want to try to avoid making another thread for something that seems to me like a dumb question. someone told me today i need to basically take the motor apart agian to put my new cam in, am i better off leaving my upper/lower off and the heads as well while i install my new cam? or was this guy just smoking crack when he was tellin me this stuff. i really dont have a clue. i thought it was just, water pump and timing goodies need to come off the front of the motor to get the cam out.?
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White 1991 GT Convertible - 1993 Cobra Motor Swap (363rwhp)
Black 2004 SVT Cobra - Chip n Tune w/ Goodies (488rwhp)
Green 1994 Explorer - Daily Driver, Ol' Faithful (317,000mi)
yea he is smokin something, you need to remove upper and lower intake,valve covers, rocker arms, push rods, water pump, timing cover and chain, also distributor, big G
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93 LX, 5.0, aod 3.73,bbk shortie headers, x pipe, pypes 2 1/2" all mandrell bent , carbon fiber driveshaft,70mm throttle body,73mm c&l meter, 24lb hr injectors,b303 cam, crane cobra 1.7 r rockers, electric fan, 6g alt,underdrive pullies,00 gt wheels 17x8 1/4 mile time 12.85. @ 108.96 mph .100% italian
I also have a 93 cobra swap with a trick flow trackheat kit with the stage 1 cam and i think the trickflow heads from summit are way better than my gt40 heads wher
lol well, i went with pro comp heads... a long time ago when i first posted this, but i too had the same problem.... i hated them, sold the car and bought an 04 cobra.... much happier now, but thanks for the advice on the heads, would have just been more useful 2 years ago
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White 1991 GT Convertible - 1993 Cobra Motor Swap (363rwhp)
Black 2004 SVT Cobra - Chip n Tune w/ Goodies (488rwhp)
Green 1994 Explorer - Daily Driver, Ol' Faithful (317,000mi)
Which Heads will flow best for my 1991 GT 
