360 Idle Quality

TT5.9mag said

The timing you are noticing indicates that maybe your balancer has slipped or the timing marks are wrong. Verify TCD before going any further.

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Before measuring the cam, I verified TDC on the balancer with a piston stop. Rotated the crank by hand to 20 ATDC, installed the stop snug against the piston, rotated until it stopped. It was right at 20 BTDC.