Quote Originally Posted by beeza View Post
Piston rings?

So these pistons will bump up the compression by the looks of it. It says 11.8 - 12.6 depending on head/block combo.Stock is 11.1

Must be cause they are oversized?
Oversized bore will lower the compression slightly but not much. Don't go by what the eBay ad says it is too general, use some of the online calculators for b series. The calculators vary a bit so it will only be a rough idea.