so,we see what the j/e measures, what does your damaged piston actually measure then, 4.530?

damaged piston measures right around 4.525

It sounds to me like the JE piston is made for a 4.530 bore so it should work fine. What is the part number ??

So, got hold of wiseco and they sorted me out with a piston and pin combo that weighs 4 grams more than my original set, will this matter or should I get the 4 grams removed from the piston?

If your removing 4 grams from pistons, take it out of the wrist pins. 4 grams is a alot of aluminum !

very true - for a direct comparison to the amount that would have to be milled off, a 5 cent nickel is 4-5gr actual weight.

ok, not easy to get milling work done like that where I am. Would 4 gram heavier piston make a whole lot of difference? Wiseco said it would be fine but not sure

SeanyB82

Yup. Just make the chamfer on the ends of the wrist pin IDs a little bigger, You'd be surprised how little it takes.

Thanks. Brad.
(937)545-8991

There are alot of forums where Wiseco said 5 grams was acceptable....that said, if you bought a set from Summit, they would take a set back where there was that much spread and replace them with another set drop shipped from Wiseco... that is Summit racing customer service ideology vs Wiseco.

That said, There can be 5 grams of carbon on a bad engine and they still live

Most every shop out there over balances the crank. Adding 5g to the piston rod assembly will never be noticed.