Ok just a quick question that is easily answered just not by me. When using the rs machines high comp pistons do you have to enlarge the valve reliefs still. I called them and they said the valve reliefs were factory size and could not tell me anymore than that. I have skunk2 pro2's for this build.

Thanks
Stephen

 

So with all the people on here using rs machines pistons no one knows?

 

Somebody has got to know the answer.

 

if you using the itr spec b20 then they have vtec sized valve reliefs, but you still need to check p2v clearence

 

thank you for the answer. I just did not want to buy them if it was absolutely necessary.