Pontiac "Performer RPM" Alloy Heads - (87cc) - Pair (Round Port)Designed for 65 79 389 up thru to 455 CI Pontiac Engines. These are way too expensive for most everybody now days. Edelbrock Cylinder Head Performer 87 cc Assembled 2. 110 1. 660 in Valve 215 This head is after designed after the 69 70 Ram Air IV Pontiac Cylinder Head.. one of the MOST favored and sort after head in Pontiac living memory.. It produces outstanding horsepower with excellent low speed torque and throttle response. These 87cc heads are