For my new engine build the only company that makes what I need is "Probe pistons" An I wanted to know if any one has ever used them before? Or if there any good?

Also if you know of good pistons that are 4.155" bore, 3.875" stroke with a 6" rod?

For got to say I need to run dish style piston.
The ones I'm looking at are. http://www.probeindustries.com/Produ...Show=TechSpecs

How big a dish?

Check out Wiseco PT105H3

I need to run around 9.1:1, So 20.5cc to maybe 15cc

With what size chamber?

Often easier to use what pistons are available ( esp where limited by combo such as yours ) and select chamber size to get desire CR

Well they are 64cc heads, an I can play around with the head gasket size to get what i want. Just worring more about the brand "Probe piston"

Probe are good pistons, ran a few sets of them in various cars. Smaller company that is willing to work with you when you want custom pistons, too!!!

Playing with the CC size in the piston will make a more drastic effect than head gasket size if it helps any, see how far down in the block your piston will be, this will help get the cr ratio right the first time.