73 pontiac 455 need help with distrbutor and timing. correct placment of number 1 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-24-2011, 09:01 PM
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73 pontiac 455 need help with distrbutor and timing. correct placment of number 1

firing order? which side should vac advance be on? this is a stock points and where is #1 on cap? do i start at TDC or past 12degrees?
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Old 05-24-2011, 10:22 PM
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Quote:
Originally Posted by flpnbrd455
firing order? which side should vac advance be on? this is a stock points and where is #1 on cap? do i start at TDC or past 12degrees?
I'm not certain which way the vacuum canister faces, but on all of the street Pontiacs that I have had, it was on the drivers side. From the factory, #1 wire goes to the second pole to the drivers side of the cap hold down that is closest to the firewall. When installing the res of the wires, remember that the rotor turns counter clockwise. Install the distributor with #1 piston at top dead center on the compression stroke. Once you get it running, use a timing light to set the timing at 16 degrees before top dead center, with the vacuum advance unhooked and the source plugged.

Bill

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Old 05-24-2011, 10:22 PM
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pontiac

number 1 is just like chevy but i think its counterclock wise , will check my 428 pontiac, well if not it will pop,
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Old 05-25-2011, 02:58 AM
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Quote:
Originally Posted by flpnbrd455
firing order? which side should vac advance be on? this is a stock points and where is #1 on cap? do i start at TDC or past 12degrees?
The firing order is: 1-8-4-3-6-5-7-2. With the distributor already in the engine, remove the distributor cap, rotate the engine to TDC w/cylinder #1 on compression stroke. Mark where the tip of the rotor is, on the body of the distributor. #1 spark plug wire goes to the terminal nearest to where the rotor points. The rest of the wires follow the firing order CCW around the distributor from #1

If the distributor is out, you can use one of the front-facing cap terminals where it's easy to see, for #1. Install the wires CCW around the cap from #1. The vacuum advance goes on the driver side, centered between the firewall and the intake so you'll have the greatest range of adjustment.

Rotating the distributor CW will advance the timing. To first start the engine after installing the distributor, turn the distributor CW w/the engine at TDC #1 compression (or "firing") until the rotor is just past the #1 terminal. This will give you some amount of timing BTDC. This will let the engine start easier.


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