Exhaust Oxygen Sensor Bung Stainless SteelThese bungs are designed to allow you to weld in a oxygen sensor bung forconvenient fuel injection or air fuel ratio calibration.

1 - sea pump pulley with mandrel for Gen 5 sea pump

Great Price

Fusioncoated or polished finishes

This unique foundry-tough cast tube style header incorporates four individual water jacketed 32" long runners and easily bolts on to most big block Chevy marine engines

Kits include Indicator

2 patented Hardin Turbulators

Max Volt or Crane spark box to the top

They are also available Fusioncoated by special order

hoses or cables through your transom

Bezel has a 4-1/2" outside diameter

and nylon braided hose with the appropriate fittings

Have you made some performance modifications and you're now making mega horsepower only to find out your stock Mercury cooler can't keep up