![]() I used ARP’s 12-point polished stainless steel head bolts. The hard rings won’t crush sufficiently and can dig into the soft aluminum. Head gaskets with stainless steel fire rings should not be used with aluminum heads. Valve to piston clearance without the head gasket measured a healthy 0.250-inch intake and 0.270-inch exhaust. ![]() Factoring in the head gasket thickness of 0.040 inches, final clearance is 0.075-inch. Combustion chamber to piston clearance without the Cometic MLS (multi-layer steel) gasketin place was measured at 0.035-inch at the upper quench area. I test-fit both heads and decided to go with the Edelbrock heads for final assembly and the dyno run. ![]() ![]() That eliminates a source of coolant leaks. The Mopar heads also have an exhaust flange extended outward by 0.125-inch so exhaust header bolts won’t hit the water jackets. The Edelbrock heads have angled spark plug locations while the Mopar Performance heads have straight plug locations. Two popular cylinder head choices for a large cubic inch big block Mopar are Edelbrock’s Performer RPM ( EDL-60929) and Mopar Performance’s straight-plug aluminum heads ( DCC-5153524).īoth cylinder headscome fully assembled and feature 84cc combustion chambers, 210cc intake/70cc exhaust ports, 2.140-inch intake/1.810-inch exhaust stainless valves, and 1.55-inch diameter valve springs rated to 0.600 inches of valve lift.
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