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i have a friend that has a 89 mustang with a 347 stroker he wants to get different heads for his car he has stock ones right now he foumd a set of real gt40 heads not p the guy told him they rebuilt 40,000 miles ago thye guys asking 200for the heads he asked me if theyy are worth that but i have no idea im in to chevy stuff more if some one could help that would be great
They usually go for $300 to $350. Thats a great price. But, for that motor, I'd go bigger!!!Quote:
Originally Posted by z28 man
unless heavily worked GT40s aren't worth the price of the gaskets to change over to them, stock gt40s might be a 30hp gain on a 347 over stock e7s. I would save your money and find a used set of twisted wedges and send them to TEA.
Iron stock GT40 and P's are good for a 302 but to make them work really good on a 347 there gonna need alot of port work.
As stated your going to need a head with at least 185cc intake runner. AFR 165's would be nice for a lower lift cam though. (like a E cam or lower)
He said his friend had stock heads, I'm guessing his friend doesn't want to spend a lot on cylinder heads. He should go with a much nicer head than GT40's but he's going to spend 4 to 5 times what he can get these for. They will be an improvement over what he has but they are definately still going to be choking that motor.
I would slap anyone that would put a set of GT40P on their engine. They suck ass. By the time you figure in rebuilding, gaskets and headers you could have a good set of AFR.
Unless the GT40 are free I would pass on them.