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Buy a timing light at any auto parts store.

Hook it up as the instructions show (the number 1 cylinder is the front one on the drivers side).

Loosen the distributor hold down enough to be able to turn the distributor by hand (but no too loose!)

Disconnect and plug the vacuum advance line.

Start the engine and let it warm up.

Point the timing light at the timing indicator on the front of the engine, and pull the trigger.

Observe where the mark on the harmonic balancer is in relation to the numbers on the timing indicator. Sometimes it helps to put a little dab of white paint on the mark on the harmonic balancer, so you can see it easier.

If the mark does not line up with the correct timing number, slowly turn the distributor one way or the other, until the mark lines up with the correct number.

Tighten the distributor hold down, and double check the timing.

Turn off the engine, disconnect your timing light, and re-connect your vacuum advance.

If your distributor has points in it, you may also have to set the dwell for best performance.

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Q: How do you set ignition timing in 455 olds?
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