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Old 04-10-2009, 09:05 PM
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Cam Timing PLEASE HELP!!

I have an urgent question about cam timing i need answered. I bought an engine that was completely rebuilt and never run. I took the cam out and put my own in and when I was putting the timing set back on I noticed the crankshaft gear had an arrow AND a punch mark (it was more of a circle and not a dot like the stock ones). The cam gear had the usual dot on it and was a GM gear. I had the pan off at the time and looked to see where #1 piston was when lined up with the circle and it was near the bottom (I don't think it was at BDC). So i lined up the arrow on the crank and the dot on the cam and #1 was at TDC. I figued this had to be right so I put everything together. Is this right? Should #1 piston be at TDC when lining up timing or should it be somewhere else? My SBC rebuild books don't say where the pistons are in this process, just to line up the dots. I want to fire it up tomorrow and really need an answer of whether or not this is correct. THANKS!!!
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Old 04-10-2009, 09:13 PM
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On a SBC the timing marks aligned the way you install the gears puts #1 and #6 at TDC, #6 firing. But definitely at TDC.

Likely, you have a crank gear from a set that had advanced/retarded timing marks along w/straight up.

If this is the case, there will be multiple keyways.

The cam timing changes are very small- you may think you're at TDC, but actually the cam might be advanced/retarded a few degrees.

To be sure, you need to verify exact TDC or find a timing set like yours that you can see which dot or arrow, etc. represents straight up cam timing (if that's what you want).

Last edited by cobalt327; 04-10-2009 at 09:27 PM.
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Old 04-10-2009, 09:19 PM
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Yes the piston needs to be @ tdc when setting you cam and unless you have multiple keyways cut on the bottem sprocket you should'nt have nothing to worry about.
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Old 04-10-2009, 09:53 PM
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Take a look here and see if it helps you.
http://www.cloyes.com/Portals/10/Tec...0(general).pdf
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Old 04-11-2009, 07:02 AM
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Ok, so maybe the pervious owner had it setup to have the cam advanced a little. I guess that's ok. I just wanted to make sure the valves wouldn't be hitting against the pistons when I started it up. Thanks for all the responses.
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