Gm Lsa Blower Pulley 2.55" Must Purchase Blower Hub Also

increase the horsepower of your lsa engine with these blower pulleys. Available in 2. 4" and 2. 55" with matching blower hub sold separately. Replace the factory pulley with the blowerhub, then you can easily install either the 2. 4" or 2. 55" blower pulley depending on the boost you want to make. These pulleys have a textured anti-slip finish to enhance belt grip. 2. 55" pulley gives up to 2psi over stock pulley, 2. 4" pulley gives up to 4psi over stock pulley. These have been tested with factory size crank pulley diameter.