Welcome aboard! I swear I used an HEI with tri-power for a short time. Cool to see a 71 GP person land here, did you get my message in a bottle or what? Ha. My 69 GP has a 455, been in there many years. So is the 421 eating race gas or... what kinda setup ya got? Theres a 72 GP that I call a parts car in my yard also. Speak up if you have any oddball part needs just in case I have it. PYforums, performance years Pontiac, has a big active forum where a lot of real GP enthusiasts are located. I'm not there but check that site out. I want to see the rest of your car!
