The JE spec sheet I have says to set the "Piston to Bore clearance at .0035" and that "some applications will require more clearance".

I was thinking about going .004 - is this a bad idea?

Engine is 3.464 (.020 overbore), 2.0L, JE 8.8:1, 18-20psi boost on S16G.

Thanks!

Wouldnt it allow for more expansion due to the heat?:shrug C'mon Gurus...I want to learn too :thumbsup

More clearance gives more room for piston expantion. People running like 30 psi will usually go a little bigger to allow the piston to expand under the extra heat. Remember the bigger you bore the more piston slap you have. I had a motor that had so much clearance the piston slap never went away! Mabye after a long drive on the highway it would go way, but then after idleing for a while it would come back. Piston slap is annoying as hell. x(

I'm no expert, but I think .004 is a bit much. Msg vtcomp and ask them what they do. They built my block and I only get a little slap in the morning, and I have run 20 psi on it.

I've decided .0040 is way too much.

Believe it or not, it turns out JE actually knows more about their pistons than I do. :cheers :+

you did not have the block bored before you got the pistons did you?

are you honing it out to get proper ptb clearances?