I am rebuilding a D16Z6 motor that was previously built with 21mm pins fitted to stock LS rods. It will be boosted to about 10 lbs. Do I need to have a custom set of pistons made (D's are normally 19mm pin diameter) or is there a shelf piston that will work with this combination? Do you guys think it is better to bush the ls rod to 19mm or hone an aftermarket piston to the 21mm pin size?

 

Bumb

 

When I talked to JE and Endyn, they would basically make whatever you wanted custom, but you would have to buy 2 sets.

I would think that a good machinist would have no problems in opening the wrist pin holes on the pistons to accept a 21mm pin and then recutting the circlip groove. It sounds like it could get expensive though and I don't know if doing this to any of the pistons designed for 19mm pins will effect their strength.

I don't think the bushings are as precise, but they are certainly a lot more cost effective.

Sonny