5.0Notch

i just bought a pair of 93 cobra heads...They are gt40s.....just wanted to know how to make them better and get the most hp out of them

ih8chevy

porting, milling, valve job wont hurt, better springs, bigger valves, better seats, and tahts all i can think of right now

5.0Notch

it that a lot of money to do ....or it just don't worth to put that much money in them....oh how about roller rockers

Does Not Exist

They're good heads...Its worth that work.

TMC

I would put a fresh valve job on them, a clean up cut across the deck and a set of new valve springs (crane makes a good kit for them with conical springs) and not much more. If you really wanted you could have the exhaust port blended. I wouldn’t put too much money into them because for the same price as a fully worked GT-40 head you could have a better set of aluminum heads.

TMC

IMO, these heads are just not worth doing that much to. You'd be better off spending that kind of $$ on better heads.

effenwright

I just installed some 93 cobra heads(gt40s)into my car last week and I'm totally happy with their performance. I also considered doing some work on them but after pricing all the parts it just wasn't worth it. I used my stock rockers from my E7's with no issues at all. I did change out to hardened push rods though since I'm doing more powerimprovements down the road. Good luck...I would just slap them on, as is, and you will feel a huge difference over the stock E7 heads....and then save up for some aluminum heads for down the road.

5.0Notch

Thanks guys ...............i can't wait to put them on.......