Just wondering if i can use CP pistons meant for a 6 bolt in a 7 bolt evo? Anyone know if the valve pockets are the same size on both side and do they have an offset pin or anything? Reason i ask is because i have some hybrid rods that have a 7 bolt big end but a 6 bolt little end (21mm wrist pin). I want to use these rods in an E8. thanks

 

I have some cp pistons here. they are not offset pin. It is easy to tell if pistons have offset or not. If pin hole is centered in boss they are not offset. the boss is always centered in piston. offset pistons the pin hole is drilled off center in the boss.

 

thanks, but i havent got the pistons yet, thats why im asking. Ive tried to email CP and others but no reply as of 4 days. Others ive spoke to said i should be able to use the CP's but i want to make sure before ordering!

 

bump

 

already answered

Only wiseco uses offset pin. ross, JE, CP, manley, mahle, all use reversable pistons.

 

thanks i must have misread your post.

 

The wrist pin size is also different between a DSM 6 bolt and a 7 bolt.

 

Yup
6bolt pistons 21mm pin
7bolt pistons 22mm pin

 

yeah, my rods have a 7bolt big end with a 21mm pin, and i want to use these rods in a friends EVO8, hence i need pistons that can be reversed and have the 21mm pin, all good!