Cheers Ryan , the story is I have a r32 Gtr 3l bottom end 26 head . Detroit locker in the arse crazy fuel setup os gieken gear box, Carbon twin plate .gt28 60 -10 turbos 260 cam 2000 I'd injectors 6 boost manifolds titanium ferrera everything for the heads oversized valves Killa springs , made 420 kw on 17.8 psi done sixth piston ring , stripped it done pistons ,rods , bearings and done better oil return better oil pump nothing else can be upgraded ! Lol but on putting it together my mechanic has found the pistons are 30 thou hanging out the block , he done the Maths and said a 1.8 head gasket would solve the problem . I'm a bit worried about the idea , don't know how it's happened to be out so far. Wondering the pros and cons on fixing the problem like that ?? Didn't think after spending so much cash I would have this problem arise at this stage of the build . Any thoughts would be appreciated