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Old 11-06-2011, 09:15 AM
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SBC timing

I have a 1970 lt1 engine in my 1985 s10 Blazer, I have the timing set as high as I can get it and the vacuum advance is hitting the intake and I need to go higher, do I have the distributor slightly off or maybe need to change the # 1 position and if so which way do I need to move it ( standing in front of vehicle). Trying to use a timing light is useless because of a balancer/pointer issue or a bad light so I'm attempting to set the timing higher until it pings, then lower it until it stops. I've told by racers and people more knowledgeable than me this would work. If this is wrong please feel free to correct me since I'm not sure of the correct procedure.

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Old 11-06-2011, 09:50 AM
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so I'm attempting to set the timing higher until it pings, then lower it until it stops.
Ayuh,... The Only way that works is with the motor under Full load, at Full throttle...
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Old 11-06-2011, 09:54 AM
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Dist is a tooth off
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Old 11-06-2011, 10:04 AM
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I am going to take a stab at an answer -- others please correct me if this will not work:

1. Pull the dist, keeping the cap and rotor positions unchanged, and rotate the whole thing clockwise (looking at it from the top) one tooth space and re-install.
This will allow you to turn the dist further counter clockwise (more advance).

OR 2. relocate the wires in the cap, moving each counter clockwise to the next hole.
This adds a lot of advance so you might have to retard the dist some to get it to fire.
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Old 11-06-2011, 10:53 AM
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Originally Posted by user151
I am going to take a stab at an answer -- others please correct me if this will not work:

1. Pull the dist, keeping the cap and rotor positions unchanged, and rotate the whole thing clockwise (looking at it from the top) one tooth space and re-install.
This will allow you to turn the dist further counter clockwise (more advance).

OR 2. relocate the wires in the cap, moving each counter clockwise to the next hole.
This adds a lot of advance so you might have to retard the dist some to get it to fire.
Thanks for the explanation, I believe I can handle it now. It runs good now but maybe there's some left to gain. Thanks to you all for your help
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Old 11-06-2011, 11:27 AM
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If you're going to do it that way, you will probably need to turn the oil pump drive rod with a long straight screwdriver to get it to align dropping the distributor back down.
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Old 11-06-2011, 01:59 PM
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Originally Posted by 68NovaSS
If you're going to do it that way, you will probably need to turn the oil pump drive rod with a long straight screwdriver to get it to align dropping the distributor back down.
Good point !!
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