Untouched GT-40 heads will give you quite a bit more H.P. than ported E7's.

1. They have larger valves
2. I seen a guy with a set of GT-40's with a stage 3 port and polish job, He knocked off a second in the 1/4 mile over his ported E7's.

So in my opinion these heads are good right out the box and they can be worked over to produce awesome amounts of power.

320+crank H.P. should be no problem with the right set-up. And in the future if you want more power (and you will) get a nice port and polish job.

Good luck,

the heads im getting are irons.

i would like to port them but i have never done it before and i dont really want to pay somebody for it again. so im thinking im just going to leave them alone. or maybe just gasket match the intake port.

when looking at these heads, is there a way to tell if something is wrong? he said thay have already had a valve job, seals, hydrolic roller springs with hardened retainers and keepers. and have been hot taked. is there anything i should look out for?

ive never bought used heads before.

what gaskets should i get for the heads and the rest....?

thanks,
adam

255 tops, save the dyno money and get a custom cam.

255 tops????? Your talking RWHP right..

I agree get rid of the 1.7 RR and get a custom cam and you will pick up some serious HP.

yep.

thanks a lot!

i think for now im going to stay with the stock cam and see what that gives me. this car is going to be almost driven daily in the summer so i really dont want to get into drivability issues.

for now whatever this setup gives me i will be happy.... i hope!

thanks,
adam

Other than the custom cam i suggested, the stock cam is a very underated and if retarded a bit works great, Avery overlooked option, i am glad you are going to use that instead of just slapping in an alphabet cam. Go stock or Custom!

yea, im planning on staying with the stock cam. the only way to retard it is to get a cam gear with multiple holes right?

for now (no more money) i am probably going to leave the cam alone but i would like to know for the future...

thanks a ton for all your help guys!
by the way, i did pick up the GT-40 heads today. beleive it or not they are GT-40's and do not have ANY thermactor air holes....!!!!

has anybody ever heard of this???

all the markings on them are the GT-40 markings...

thanks,
adam

so i got the GT-40 heads yesterday. they really dont have the thermactor ports in them. they do have GT stamped on them as well as a "71" up by the valve cover openings. what year heads are these???

they do have 1.84/1.54 valves, and the 3 bars on the end of the heads.

could somebody help me identify the year of these heads? or are they some sort of aftermarket motorsport head???

thanks in advance,
adam