ok thanks, i was told block gaurds will help with cylinder cracking but it will just crack the block in another place.... and well i guess im not goin to be doin 12's with this block, but low 13's with a 50-75 shot will be fine for now. this is the first honda engine i will be buildin, while this engine is breakin in i'll just save for the dart block or a sleeved block and b20 forged pistons.....