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Ol' Ron · 02-08-2018, 04:03 PM

After the compression stroke the next time the piston is at TDC BOTH valves are open. This is called "split overlap" and is a good way to check if the cam is in right.

02-08-2018, 04:03 PM	#7
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Tdc #1 heads off? After the compression stroke the next time the piston is at TDC BOTH valves are open. This is called "split overlap" and is a good way to check if the cam is in right.