NOTE: All Holley 174 Powercharger kits for big block Chevy engines now come equipped only with a 10-rib idler. This part is heavy duty and it's built with a stiffer spring, bronze bushings and very tight clearances. Idler assembly, P/N 155258 is available for upgrading earlier 174 installations.

The 174 Powercharger is the blower that started the marine supercharging craze. Its proven service record, great performance and low profile make it a natural for installation on boats with tight engine compartments. Up to 550 hp can be achieved with this system on engines from 454 CID to 500 CID.

The 174 Powercharger kit includes close-tolerance Teflon tipped rotors, an integral 1x4 carburetor mounting pad, intake manifold, heavy duty 10-rib serpentine idler assembly, pulleys and belts, thermostat housing adapter and all hardware. The upper pulley is chosen separately, based on the engine size and amount of boost required.

It's designed to interface with all big block MerCruiser drive accessories. This same unit can also be used with OMC and Volvo marinized engines.

Dollar for dollar, there is no more horsepower available for a 350 small block V8 than can be gotten from the Holley 144 Powercharger marine supercharger. This kit will add an easy 80 to 100 hp to this small block motor.

If you're like many small block V8 boat owners, you may have come to a point where you're no longer totally satisfied with the performance. You've added exhaust and an upgraded ignition, yet you're still not getting the power you want. Where do you go from here? The Holley 144 Powercharger is the answer.

The 144 supercharger kit is the most complete marine small block supercharger system available. It includes Teflon tipped rotors, an integral 1x4 carburetor mounting pad, intake manifold, heavy duty 10-rib serpentine drive pulleys, belts, all thermostat housings and hardware. The upper pulley is chosen separately, based on the amount of boost required.

It's designed and engineered to interface with all small block MerCruiser Alpha and Bravo drive accessories and can be used with OMC and Volvo marinized engines.