I am doing a top end, cam chain, ect on my 2010 YZ450f that I bought used last year and they head has the signature of an engine builder on the side. I know it has been ported but I am planning on using a high compression piston and want to make sure the cylinder wasn't machined for higher compression already. Does anyone know the height of the cylinder from gasket surface to gasket surface? If not could someone put some calipers to theirs on the outside and check? Thanks!