"Motor has 4000 miles on rebuild from experienced engine builder..."
What does the builder have to say about this problem? He should be able to resolve this pretty quickly if he knows what he's doing.
16 heads are gonna be at least 75CC's...dished pistons will add another 25 CC's...??? That's quite a bit of volume in there. Right?
It's been 5 years since the build. So not sure what he would do. I don't understand why it did not show up on the dyno. I know he had a lot of trouble that he kept planing on the carb. I can only assume he was running race fuel on the dyno.
As far as the cc the dish was cut .100. Someone calulated it as (24cc / .180") x 0.100" = ~13.3cc. This was based on his piston. His was 24cc with a .same valve relief. This would put the CR 9.6.1