psivyss

just after some info on clearance for je forged pistons there 4'' the block is a sleeved ls1 alloy block it will be making 450 to 500rwkw with a vortec v7 ysi blower on round 15 psi what should the piston clearance be the car is driven regualy on the street

KCS

iTrader: (20)

That's something JE should answer. Call them with a part number, usually stamped underneath the piston, and they will answer for you. It should have been on an information card that came with the pistons, and/or written on the box somewhere.

psivyss

i lost the paper and the pistons are at the engine builders the motors built with .005 clearance i was just wondering if that would be ok

KCS

iTrader: (20)

IMO, .005" is kind of loose, usually .004-.0045" is normal. It may be a bit noisy on start up, but it will probably be ok. Again, JE knows more about the characteristics of this piston, so they would know better than me.