I'm building a 1992 Integra GS-R to race in ITS. The B17A1 engine in it is pretty uncommon and I'm having a *very* hard time tracking down anybody who makes 0.040 (or even 0.030 or 0.020) over pistons that don't have a big dome for high compression or a dish for turbo applications.

The biggest overbore that Honda offers is a 0.010 over. I've tried a few OEMs (Topline & ITM Engine) that have pistons for the car listed in their catalog but none of them actually make the pistons.

Anybody know of a possible source for these that won't involve having them custom made?

Thanks