Well, I thought I had super eta pistons, come to realize they are second oversize (84.48mm) 325i pistons, I'm running them on 130mm rods and 81mm crankshaft, so the pistons are in the hole just a bit. I've read this combo gets a comp ratio on 8.0:1 and I know that's pretty freaking low for an m20 :( , the block has been machined 4 thousandths and the head is a built metric mechanic, I tried measuring but from my measurements it's never been machined. my question is, how much of a slouch does it really make the engine off boost? I have a bad feeling it will be a dog but I'm hoping someone can tell me otherwise...
