I'm getting mixed answers to a question I thought was a stupid question. I'm looking at p29 75.5 mm pistons for my z6, currently it's stock block, would I have to bore the cylinders to make 75.5 mm pistons fit? Or will it fit into stock cylinders? I'm going to at least hone but I didn't know if I had to bore as well.

It sounds like a stupid question, so I'm expecting everyone to say the obvious answer of yes bore .5 mm to match the piston size but getting mixed answers from my friends makes me think otherwise.

Thanks HT.

 

You need to bore it to the new piston size since stock is 75mm. Unless your current block has already been bored to 75.5

 

Thanks a Lot for the clarification.