thanks tech but i already knew all that. what im doing is running a 406 with 5.7 eagle rods with cap screws, the cam i have in it has .464 intake lift and .470 exhaust lift with 114 lsa. this is in a computer controlled environment so vacuum is a must. i thaught i read somewhere that you cant run too wide or too narrow lsa because the lobes would hit the rods as the crank swings by. if i remember right i think its the exhuast lobe on the # 6 cylinder and cant remember the other one to watch out for.