Timing on a big block - Team Camaro Tech
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post #1 of 6 (permalink) Old Jan 8th, 06, 09:06 PM Thread Starter
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Timing on a big block

I have a 69 camaro with a 77 454, I think. It has an HEI ignition. What is the timing on this engine?
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post #2 of 6 (permalink) Old Jan 9th, 06, 09:53 AM
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Re: Timing on a big block

No one can give you definitive answer based on that info. But a good starting point would be 8 to 10 degrees BTDC at idle, with additional 24 to 26 of mechanical advance, all in by 3,000 rpm.

You should also use the vacuum advance. I use "manifold" vacuum, which has vacuum at idle. Some guys like to use "ported" vacuum, which has increasing vacuum as engine speed increases. Experiment with the vacuum advance to see which works best for you. Limit the vacuum advance if it's pinging by getting an adjustable vacuum advance unit.

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Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #3 of 6 (permalink) Old Jan 9th, 06, 03:59 PM
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Re: Timing on a big block

I would use 15* initial and 20* mechanical, that is what I run on my 454. As long as it starts fine warm run as much initial as it wants.

Bob
Garnet Red 69/SS396/TH400/355 Posi Sold
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post #4 of 6 (permalink) Old Jan 9th, 06, 06:53 PM Thread Starter
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Re: Timing on a big block

Thanks, I am new to chevys. Timing pickup connected to left front cylinder. Correct? So at idle with vacuum advance connected it should be 15 degrees or so? I believe this is above the scale on the timing marK? Mine seems to run better when the mark is significantly above the marker.
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post #5 of 6 (permalink) Old Jan 9th, 06, 08:40 PM
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Re: Timing on a big block

On a warm engine, disonnect and plug the vacuum advance, then set the idle to about 7-900,..whatever she likes.

Then set the initial timing to about 10 degrees as stated above,..recoonect the vacuum advance, then drive her. If she doesn't knock or rattle (most noticable when you stomp on her at lower rpm), then bump to 12, etc.

When you find the detonation point,..or pre-ignition, then back her back down a bit, and lock down the dist.

Fyi,..my cars all like around 15 degrees (+/-),..I run 93 octane.

Good luck!
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post #6 of 6 (permalink) Old Jan 10th, 06, 08:59 PM Thread Starter
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Re: Timing on a big block

Thats awesome, thanks for the info.
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