Industrial Injection PDM street heads include a fire ring, CNC-ported valve bowls and exhaust port, plus 150 lb valve springs. Built for street-oriented applications, these cylinder heads combine CNC porting work with heavier 150 lb springs and a fire ring to deliver an upgraded street head package where increased valvetrain control and ported flow are desired.
Industrial Injection Fire Ring / CNC Ported Valve Bowls / CNC Exhaust Port / 150LBS Valve Springs