I just got my type s pistons, so how can I tell if its the .25 oversize that I order. I just want to make sure that its correct, and the part number is 13030-p5p-j00.

 

on the bottom of the piston,there should be no letters on them.If there is an A or B on them in black,then it is a standard size piston.

 

sounds about right.. i'll check the part number but mine are j00 at the end too and are oversized..

on the top i beleive it says "A0" that means oversized"

 

*cough* measure it.*cough*

 

haha, yeah I don't have a ruler or any measuring device. Well from the information I guess they sent me the right one, thanks.

 

I've never seen the Type-S pistons, or Prelude pistons for that matter, but the way the B-series pistons are labeled are:

A0 = USDM
(ie: P72-A0 is USDM GS-R...10.0:1 CR with P72 head; P72-00 is JDM GS-R....10.6:1 CR with P72 head)

25 on piston crown = .25mm overbore


[Modified by IN VTEC, 11:51 PM 2/21/2003]

 

well check on your rings.. i know my rings mark 0.25 etched in very small that's my indication.......

 

If you don't have ANY measuring device and aren't willing to go get one you have no reason to be modifying your car. Just throw it at someone who will suck up your money for simple labor and say "just have it done before the end of the month, i will give you $$$"