How much overbore does the J's racing JDM Balanced Pistons have in comparison to the stock USDM pistons?

I know it bumps compression to 11.7:1 but i need to know how much overbore it has

 

Anyone is welcome to correct me if I am wrong.

The CR of 11.7:1 is stock JDM F20C. Japan has better gas then we do here in the states. This was done using a different head gasket then we have here in the US. The pistions themself are the same.

A balanced set of pistions would be just that. All pistions in the set weight exactly the same amount. It just take time to balance as set. You just need scale and remove a bit here and there from the pistion.

 

I didn't think the bore (ie, piston diameter) was any different from stock.

 

so you are saying the J's racing pistons are exactly the same at the stock USDM F20C pistons, that there is no difference, just the head gasket is different?

can anyone confirm this. Becuase if that is the case, I will cancel my order of these pistons

 

I think you're asking two different questions. JDM pistons I believe are the same as USDM. I have no idea on J's racing pistons.

 

ok maby i mis tittled it. I thought the J's racing pistons were just the JDM ones but from js racing

ok what about then if that is the case. the difference in bore from USDM stock to J's racing Pistons

 

Product inquiry, Moving to S2000 talk

 

Are you talking about these guys?
http://www.aj-racing.com/catalog/product.p...6&cat=91&page=1

If so, the bore is identical to USDM stock F20C pistons.