AA Performance Stage 1 Ported/Polished Cylinder Heads, Pair
Ported cylinder heads will always produce better torque and horsepower than heads that are "as cast". For any motor, these are a terrific upgrade over stock. Valves are 40mm x 35.5mm. The round ports on the Stage 1 heads produce great torque and low-end power. They're great for small displacement motors with mild to mid-range cams, terrific for buses and heavy vehicles, and will work much better than stock heads for larger displacement engines.