... Hardened Exhaust installed, 8 New Teflon Intake Seals 8 Umbrella seals on Exhaust, Retainers and Keepers. Screw in Studs and Guide Plates were installed. The heads have been Magna Fluxed and Pressure Tested. And have been milled .010 off. Valve Springs will accomodate .500 lift Cam with ...