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Old 09-30-2010, 09:39 PM
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timing mark wayyyyy b4 btdc

cant time the motor with a light. when i crank the motor to tdc its at exactly 12 oclock. the mark for tdc is at about 2 oclock on the timing tab. i put the cam in and lined up the zero marks on the crank with the zero mark on the cam gear. the motorr runs mint. i can time it by ear damn close but i want to do it with a light. i plugged my vac advance as well. i even trying to get the mark to line up is impossible. help please.
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Old 09-30-2010, 09:41 PM
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Old 09-30-2010, 09:53 PM
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If you are sure about the location of TDC, you have the wrong tab for your balancer(or wrong balancer for your tab). SBC has 3 different TDC/timing line balancer locations - 2:30, 2;00, and 12:00 depending on the year of the balancer.

What parts are you using?? Year, or where they came from, and stock or aftermarket??
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Old 09-30-2010, 09:58 PM
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Quote:
Originally Posted by jls4speed
cant time the motor with a light. when i crank the motor to tdc its at exactly 12 oclock. the mark for tdc is at about 2 oclock on the timing tab. i put the cam in and lined up the zero marks on the crank with the zero mark on the cam gear. the motorr runs mint. i can time it by ear damn close but i want to do it with a light. i plugged my vac advance as well. i even trying to get the mark to line up is impossible. help please.
There are several different dampers. Both the diameter, thickness and the placement of the line on the outer ring of the damper can differ. So you need to know what you have, to know what tab to use.

The three most common locations for the timing mark on the damper:

The pre-'69 damper has the TDC line on the outer ring at the 2:30 o’clock position- or 2º before- (i.e. to the LEFT of the keyway, looking at the front of the engine) the keyway centerline. The keyway is seen in the ID of the damper.

The damper used from '69 to mid-80's has the TDC line at the 2 o’clock position- or 10º before the keyway. You'll find that aftermarket dampers are the 10º type, as are the bolt-on tabs sold in the aftermarket, unless they're adjustable.

A third timing mark was used from about 1978 to about 1991-'92. It is at the 12 o’clock position- or 40º before the keyway. This damper uses a timing cover that has the tab welded on at about the 12 o'clock position.

If you're unsure, or just want to check the accuracy of the tab/mark for TDC, DETERMINE TDC and MAKE A TIMING TAPE will help you to see for yourself.
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Old 09-30-2010, 10:08 PM
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ok the motor is a 79 350. i used the damper off the original 305 b/c it was the same as the one on the 350. EXACTLY THE SAME. i used the timing cover and tab from the 305 that the kid put in the car b4 me. i know everything was installed right and now that i think of it all my other trucks and cars from the 70's and 80's had the tab at 12 oclock. it has to be the wrong tab because its at 2 oclock. great. now i can sleep tonite.
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Old 09-30-2010, 10:10 PM
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You're not using an adjustable timing light are you? Just a thought.
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Old 09-30-2010, 10:14 PM
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im figuring the kid bought the cover and bolted on the bolt-on tab for looks because the same problem occured when i tried timing it with a light when it was on my 305 in the same config. i was scratchin my head then too. keep giving me feedback guys if you think i should check anything else but im pretty sure i just need the 12 oclock tab. do they sell the 12 oclock tab aftermarket that bolts on or do i really have to take all my accesories off for a new cover? timing tape?
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Old 09-30-2010, 10:17 PM
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Quote:
Originally Posted by jls4speed
ok the motor is a 79 350. i used the damper off the original 305 b/c it was the same as the one on the 350. EXACTLY THE SAME. i used the timing cover and tab from the 305 that the kid put in the car b4 me. i know everything was installed right and now that i think of it all my other trucks and cars from the 70's and 80's had the tab at 12 oclock. it has to be the wrong tab because its at 2 oclock. great. now i can sleep tonite.
Keep that tab if you want and just put a "new" line on the damper to align w/the tab's "0°" (TDC) line. Easier than replacing the timing cover for one w/the tab @ 12 0'clock, IMO.
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Old 09-30-2010, 10:22 PM
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x2 what cobalt said. You could also use a timing tape, stick it on your balancer, and shellac it, works well.

You can buy pointers all day long at Summit and JEG's.

http://www.summitracing.com/search/M...ord=timing+tab
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Old 09-30-2010, 10:58 PM
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thanks guys.cobalt u just gave me a very easy and cheap solution. heres a question though, just so i know for peace of mind, what is the exact measurement of the original timing mark on the damper to the tab at to 2 oclock set at zero and the same for the one for 2:30? im sure its the tab at 2 oclock but i just want tto be safe. i could just eyeball it but id rather have an exact measurement if somebody knows it off hand.
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Old 09-30-2010, 11:06 PM
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Someone may have that answer in degrees if the size of the damper is known.

You need to find exact TDC, with a positive piston stop in the #1 cylinder. Pull the plugs, rotate slowly by hand one direction to the stop, mark the damper, rotate the other direction to stop, mark the damper, TDC is the middle. Mark the damper, mount your pointer, set it on zero, done. Now time it.
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Old 09-30-2010, 11:35 PM
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Amen SS, if half of the rodder populus did this we would all be lonesome.
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Old 10-01-2010, 12:43 AM
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Quote:
Originally Posted by jls4speed
what is the exact measurement of the original timing mark on the damper to the tab at to 2 oclock set at zero and the same for the one for 2:30?
Explain again what measurement you're asking for- is it the distance from the OD of the damper to the tab?

What you really want to know is where "0" (TDC) is, then use the circumference of YOUR damper to know what length measurement equals how many degrees.

If you make a timing tape, it will be accurate for the size of the damper you have, just use the tab for zero. If the tab's other degree markings (other than "0" or TDC, that is) match up to the timing tape, fine. Otherwise ignore all but the TDC mark on the tab.
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Old 10-01-2010, 07:23 AM
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What timing light and what type of ignition (msd ?), some lghts just don't work

do what SS said, use s piston stop and start fresh. Make your own marks instead. Once it's done you'll never ever have to do it again
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Old 10-01-2010, 07:39 AM
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maybe if the monsoon stops i can pull my car with no hood outside and hopefully make some progress. i havent posted a thread on this subject but do u guys know of a parts store or website that sells good luck?
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