see old hippie the problem is his truck weights in at 3900 lbs. and your roadster weights in at 2500 lbs. the cam that works best for him may not be the best for you. JIMO.! i think that if he is running a 4x4 these cams are to big for his application. even at 3900# 2wd a 290 duration cam is to big and for an manual trans u can have a tighter LSA like 106 an automatic 110 and up. anything to add anyone or correct me please if i am wrong