I posted in the injection section but figured I might get more help here.http://coloradok5.com/forums/showthread.php?t=194522. I have seached here and on Thirdgen but nobody seem to agree. I would like to keep the cam thats in the engine or at least find another tbi friendly cam that will work. Smog is not an issue and I will be upgrading my chip, tbi, etc, I just want to know how big a cam I can use that will make good low end torque? Also the block I'm using is a 4 bolt pre 87 and I want to know if I can put a roller cam in it, I just want to keep my options open?