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Message: [QUOTE="Grady, post: 1389121, member: 20275"] A timing light will only help you determine TDC, you could be on the wrong TDC. As Pantsless Pat mentioned, and I don't know if is is relevant, but a way to tell if you are 180 degrees off is to crank the motor by hand, until the intake valve opens on #1 cyl, then closes, then, the next TDC mark will be the one that the lines up with ignition firing (of course there will be some degree of advance, but it will be close). [/QUOTE]