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Verify adequate valve to piston clearance before running your engine with a milled cylinder head
racing tires
Must use when spinning a lot of rpm and making big horsepower
so block decking is not necessary
High grade aluminum with lightening holes
79cc/99cc Cylinder Head, Ported & Milled (core required) Porting & Milling:Porting / Mill .065" (Check Clearances) Verify adequate valve to pistonYou are purchasing machine work for your cylinder head which needs to be sent to us. The factory castings have rough edges from the machining process which limits the cylinder heads power potential. We port the cylinder heads to increase performance. We also mill these cylinder heads to increase compression. The added compression will improve your engines torque and overall power. See our article on performing this modification on our test engine.