1 Pair of Complete GMM CNC Ported LS1 (241) Heads and Valves - "Change Over"
What you get
CNC ported intake and exhaust port
ultra sonic process
16 valves ground
8 intake valve seats turned on Newen...
FAST engineers teamed up with airflow specialists at RHS to develop polymer intake manifolds for GM LS based engines. Testing on a near stock LS7 engine with a Big Mouth 102mm Throttle Body produced...