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The dial indicator is on the valve spring retainer, as all instruction state. I began this whole process, with the tappet cover removed and a dial indicator directly on the tappet, only because I was still p&p my cylinder head. After consistently reading a 110.5* centerline, with the dial on the tappet, I started trying different configurations... But all consistently repeated.
For tdc, I set up the dial on the piston crown, found max piston travel, rotated to .010 before/after max, marking the degree wheel, and splitting the difference for true TDC. For centerline I rotated CW to .010 before/after max lift of #1 intake lobe, mark the wheel (123* and 98*), add them together (=221) and divide by 2 (=110.5).
What could actually cause such a large spike, only on this one tooth of the gear?
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