The main difference in the GT40P heads is the spark plugs are relocated. Depending on the headers you have, the plug or the plug wire may come into contact with the headers. If you already have the heads, you might want to try them with your existing headers. They just might work.
no I don't have the heads but I can get them cheap and all the research I've done they seem to be the best for the buck. stock gt40p outflow gt40' and ported e7's. I just want I cheap head thats better than stock.
Yeah, this address appears to be "parked" or no longer active. It was the correct site at one time. Dennis Hilliard owns/owned CCM and it is/was located in Tehachapi, CA. They may no longer be in business, but you might want to make a phone book search and call them. Too bad if he isn't in business anymore 'cause they were the only ones I know of who carried that header. They are/were a big GT40P dealer.