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Old 09-14-2007, 05:03 PM
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Timing tab on top

Another question:
I have the heads off my 350 SBC and turned the motor over by hand until the no 1 piston is up. The timing mark on the 8" harmonic balancer is straight up and I can see part of and feel a timing tab on top. The water pump is above it.
Pardon my ignorance, but what's the trick in using a timing light and seeing the timing tab when the water pump is directly above the tab and obscures the tab from view?
Thanks

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Old 09-14-2007, 05:07 PM
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Yea, there are different timing cover/balancer combinations. If yours is up top, it is kinda tricky looking straight down behind the water pump but can be done, providing you have the correct pump on the engine.

Mark
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Old 09-14-2007, 05:17 PM
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Mark,
Thanks, I'll head out the to shop and have a look from straight above and see what I can see. Makes you wonder what GM was thinking, doesn't it?
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Old 09-14-2007, 05:43 PM
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Actually, the "up top" tab is not that bad given the tight quarters and the P/S pump. The stock version of that tab had a tube thingy on it too that was used for a sensor on the older scopes to read timing on the scope without using a light. Pretty cool "back in the day"! LOL
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Old 09-14-2007, 07:59 PM
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Well I can't see the timing mark. The gap between the water pump and block is about 1/16 of an inch it is just not big enough to see the mark looking straight down.
Now what?
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Old 09-14-2007, 08:46 PM
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Which water pump is on it? Long or shorty. Sounds like the short, older style pump is on it now. You may have to switch to the smaller balancer and timing cover or just add the bolt on tab with the smaller balancer.
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Old 09-14-2007, 09:49 PM
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Chevys used a 12:00 O'Clock, a 2:00 O'clock and a 2:30 O'Clock timing position. You can change your timing position using a 2:00 or 2:30 tab and a timing tape on your damper. Follow this procedure, except with the heads off, use a piece of strap steel (1/4" X 1" works well) which bolts across the cylinder bore and has a bolt threaded through it to act as a piston stop.....
http://www.crankshaftcoalition.com/w...ff_for_newbies

Scroll a little more than halfway down this page to "Positive Stop Method of finding T.D.C." to see the strap and bolt.....
http://www.iskycams.com/camshaft.php
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