Harley davidson twin cam cnc ported heads10/31/2023 ![]() ![]() ![]() The Street kit however, includes the CNC ported heads, stock chamber volume, 1.875 intake valves and will accommodate cams up to. You would not want to run these heads on an 88" motor, even with the 10.5:1 pistons. The Race kit includes the CNC/MVA heads 98cc chambers, 2.120" exhaust valves, very stiff springs and will accommodate cams up to. There are two Stage IV kits, Street and Race and each includes a different set of heads. The long answer is a bit more complicated. Click to expand.The short answer is yes, Stage IV heads will fit your cylinders.
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