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Chevy 454 Timing Instructions - It Still Runs
https://itstillruns.com/chevy-454-timing-instructions-7550522.html
Step 3 Disconnect the vacuum advance hose on the distributor and plug the hose with a screw. Start the engine. Shine the timing light at the harmonic balancer timing mark on the driver's side of the engine. Read the number on the timing plate adjacent to the timing mark on the balancer.
Setting the timing on a 454 - Hot Rod Forum
https://www.hotrodders.com/threads/setting-the-timing-on-a-454.389850/
Advance your timing until it pings or is hard to start. Put your timing light on it, read it and then pull your timing back 2 degrees. Get it warm again and retest. No ping and starts good hot tells you you're at max initial timing for your motor. With that number you'll likely need to limit the mechanical timing in the dizzy.
454 Timing - Team Chevelle
https://www.chevelles.com/threads/454-timing.38644/
Take the total timing that you want - say 36*. Divide that number by 360 and multiply the result x 25.136 [the circumference of a 8" diam damper]. So for 36* total timing you would mark your damper at 2.51" ahead of the timing mark. Then rev the motor slowly until you have full mechanical advance.
454 ignition timing. - Chevy Message Forum - Chevy talk
https://chevytalk.org/fusionbb/showtopic.php?tid/111505/
The 454 has a ratio of 1.53:1 so I would expect the timing to be somewhere in between. Obviously there are all the other factors such as compression ratio, fuel quality, cam, combustion chamber design, etc., etc., etc., but I am talking …
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