Originally posted by Mabuchi540
Must be our different understandings of the word "perfect fit" then I guess.
I got some with larger holes than the stock ones I use because people have said time and again "perfect fit" now the ones I've ended up with are way to fast with the weight of oil I have and I have no thicker oil.
I would have to agree, that the Rayspeed pistons are more of a perfect fit.
Which ones are you running and what did you run before?