The markings on the piston is .30 over but when i ordered it from summit the specs were the same as the one in the book. The markings on the piston is 235np .030 10159.I do know that the front where the rings go are the same in diameter as the old ones, except the skirt on the new one is larger than the old ones.
Yes Im using a ring compressor but i dont know what the ridge ring is . Thanks
