Yeh after your post I rang another engine specialist and he said what the f@@@@, you need at least 35" clearance, I told him about the small inaccuracies and he said thats fine but the tops should have been machined to suit, so there all the same height. Gonna have to buy thicker gaskets and strip it down again and put them in, not happy, hope I havent already cracked or stuffed something
Steve