what they said. .018(.45mm) gasket tightens up quench well, raises compression and makes a diff. .55mm hg is only .004 thinner than stk. and not worthwhile as a single mod. best option to reach your goal, .45mm hg and .015 deck, next your .55hg and .020 deck, both increase torque and power everywhere.deck is cheap for power gained, I pay $40 for all my heads. working with stk. pistons this is optimium setup and will make a difference in et and mph, especially with cam and proper degreeing. valve to piston will be fine degreed properly. hg and deck combined is worth the effort, expect around 5hp and increase in torque over stk.hg and unmilled head.
Last edited by gazx10; 03-10-2014 at 10:56 AM.