i had an LS motor with 12.2:1 comp ratio pistons, a JG built redline head with huge cams, intake manif, and t body to go with it. i put it together like 5 times and it wouldnt start. i had a guy who builds pro mods check my work. it was all good, finally a kid said push start it, i said are you stupid.......it worked...if you dont have huge cams and everything is TDC you cant hurt anything...what have you got to lose at this point