Hello again gang, check this out, l20b 86mm 280z flat top piston ,w58 peanut head, hitting stock felpro gasket fire rings bad! Can't get the gasket even ,this is number 3 of gasket change. I've tried to line up the gasket before and after I put the head back on but the piston end up hitting bad. So my questions are , where to go from here? Will a Nismo 88.5 over sized gasket work for a 86 mm bore? Is there supposed to be more space between the top of the cylinder and the top of the block? Seems the gasket is flattened more than 1.2 mm by the piston hitting it. Does Nismo have a better size gasket? Does anyone? What am I doing wrong? I got 3000 miles out of the first gasket until it blew on number 3 cylinder. It's a fully rebuilt head and bottom end from a reputable California Datsun engine builder. Please help if anyone can . Thanks guys. 38/38 weber, when it runs it runs very good!