The part number for these pistons is 232516. They are 4.125 bore and are inverted dome for a forced induction application. Do not mistake these pistons for the cheaper SRP pistons. These are the extreme duty pistons that cannot be purchased less than $680.00. I'm asking $500.00 for them which is what you'd pay for the lesser SRP pistons from someone else.

Here is a link to JE's website:

http://www.jepistons.com/cat/je/auto...y_23_inv.shtml

 

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