Meticulous Mouse For The Mule
The Chapman 15-degree aluminum cylinder heads were a late choice after I spoke with the pros at Scoggin-Dickey (I was originally going to run 18-degree heads). After mocking the heads on the block with a piston/rod/crank combo in it, Urban found he needed to open the radial valve clearance .080 inch for the intake on the Arias pistons (because they were built for the 18-degree heads). Once that was done, he polished the surfaces to eliminate any of the machining marks.
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