At Tim Zepp Engines, (formely Jersey Cylinder Head), we have specialized in cylinder head development for over 17 years. We have spent countless hours on the flow bench, dyno and the race track to give us reliable feed back and testing results to be able to offer you exceptional cylinder heads, that have the proper flow, runner volume and cross sectional area needed to make exceptional torque and Horse power.We have just listed a few of the cylinder heads we offer. if you need a set of heads that are not listed, call us and we will give you the information on the heads you are looking for.