Total distributor timing. - Pontiac GTO Forum
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post #1 of 4 (permalink) Old 10-15-2015, 12:53 PM Thread Starter
 
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Total distributor timing.

I have a 1970 GTO with a 400 engine. It is basically stock. Standard distributor except I added Petronics to replace the points. Base timing is set at 9 degrees per the manual. At 2500 RPM it is only advancing by 14 degrees for a total advance of 23 degrees Is this correct or should it be higher?
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post #2 of 4 (permalink) Old 10-15-2015, 04:47 PM
 
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You should be closer to 36 degrees all in at that rpm. What springs are you using for your advance? Also, is there any pinging/detonation? What octane are you running on this original engine?
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post #3 of 4 (permalink) Old 10-16-2015, 11:51 AM Thread Starter
 
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No ping. I am running premium non ethanol gas. I do not which springs I am using. was going to look this weekend. It was originally an auto that I converted to a Tremec 5 speed. I also thought it should be closer to 36 degrees but was not sure.


Thanks for the input.
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post #4 of 4 (permalink) Old 10-17-2015, 03:03 AM
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Agree on "vicinity" of 36 degrees total (no vacuum advance). Which heads are you running? You can get more travel out of your distributor by following the instructions part way down this page => Setting Ignition Timing Curves - Chevy High Performance Magazine (use a smaller bushing, or remove it completely).

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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Engine Tuning and High Performance

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