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Old 03-03-2005, 06:09 PM
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TDC and timing chain

I used the gear puller today to remove the crank gear to install an new timing chain. Problem was, the crank moved as I was tightening it...I got it back to approx. where it was. My question is, when I got to TDC before I started working on the engine I took off the heads. It was just a hair off of what was actually TDC...how accurate does TDC have to be if your trying to figure it out w/ the heads on? I'm going to be as close as possible, but will a mm off screw it up? Its a 76 305. Thanks, Adam

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Old 03-03-2005, 06:13 PM
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Adam just make sure #6 piston is at TDC the small mark on the crank gear will be at 12 o,clock and then make sure the cam gear mark is at 6 o,clock.Unless you are degreeing the cam in you will be fine.when you have it bolted up turn the engine over by hand a couple of times to make sure you marks line back up.


thanks corrected my mistake

Last edited by Rogers Performance; 03-04-2005 at 07:37 PM.
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Old 03-03-2005, 08:16 PM
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Okay, here's another question. I put in a new cam and the new chain doesn't have the same timing marks for the cam gear. The original had the pointer on the top of the gear, the new one has a dot. I don't know which position the dot should be in, where the pointer was, or lined up with the dot on the crank. I know its a stupid question. When the cam is lined up, will the knub on the outer cam journal be to the left or the the right (looking at it from the front). Thanks, Adam
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Old 03-04-2005, 02:24 PM
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Arrow or dot doesn't make a difference. Line the cam at 6 oclock and the crank at 12 oclock as was stated and you will be fine.
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Old 03-04-2005, 02:45 PM
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Real good advice.. Just remember on a V-8 chevy that when the two marks are together you are on #6 not #1. You must turn the crank one revolution to be on #1
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