Originally Posted by
jlfx car audio
What I'm not getting is why r u all changing to 1.3/8 pistons to get more pack than the stock 1.1/10 pistons r they designed different
Overall area that the oil travels through is what is different. The area when combined on a 1.3x8 hole piston is less than 10 holex 1.1mm. The 8 hole will have more pack.