Question on Cam Gear Marks - UPDATE

[bbrocksr]

Originally Posted by Russ/40

Mart, I don't know how else to state it. The exhaust valve on number 6 is barely perceptible to be off the seat, and the intake is closed when number one is at TDC. One thing puzzles me Mart. How is it we are talking about number 6 in this timeing discussion.

Brian, I've had the heads off this thing three times. In the past I have never had to do that even once. It would be my very last ditch effort to do it again. Can the cam be degreed without removing the heads?

When number 1 is at TDC firing, number 6 is at TDC overlap. The easy way to find TDC firing on number one is to put number 6 on TDC overlap.
Overlap is when the intake and exhaust valves are both off their seats at the same time for a few degrees at or near TDC number 6.
number 1 & 6 come to TDC at the same time, one is firing the other is
overlapping.
Intake valve opens 0 degrees BTDC on a stock 59a , so if the intake on number 6 just starts to open at TDC the valve timing is correct.
Bill