Timspony

GT40 irons a good head, but I would port them for the best results..........IMO

83gtragtop

Why waste your time?

projectresto83

If you have the $1000 already just save a little extra and go aluminum. Lighter and if ported flow a hell of a lot better than ported gt40's. GT40's are more for the poor boy racer like myself who can not afford a set of aluminum heads. The are good heads but deifinitly not the best.

JD5.0stang

ok ill lookinto the cam too but do i just swap it in or do i need to make any computer adjustments

mjr46

ecm will adapt to mild bolt ons with no problems