Im about to have my b16 cylinder head refurbished, and im thinking of going with oversized valves. The question is, will the valve reliefs in the stock bore CTR pistons accomodate 1mm oversized valves? I do have the ability to machine the reliefs out larger, but it is a very tedious process and I would rather not take weight out from an otherwise rather balanced set of pistons. Any help would be appreciated.

-matt

 

measure the diameter of the reliefs. if the intake relief is bigger than 1.339 (34mm) and the exhaust relief is bigger than 1.142 (29mm) i would assume that they would work but i dont know for sure. plus if you take the same amount off all the pistons they should stay balanced.