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Old 05-11-2019, 03:58 PM
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Pontiac 400 timing

I just did a cam swap and it's just about together now but I just realized that I put my timing Marks wrong.

My crank is at 12 and cam at 6. I read that it's not a big deal but I need to make sure I time it on the exhaust stroke instead of compression stroke. Point the rotor at #1 like usual?

Then I read to put it tdc #1 and point the rotor at #6

I want to make sure I get it right.

I totally forgot I made this mistake years ago when I put my previous cam in and I was 180 out. Sounded like a bomb went off under my car out of the mufflers lol

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Old 05-11-2019, 04:19 PM
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Cam at 6:00 and crank at 12:00, dots close together is TDC #1 overlap/ TDC #6 firing....put distributor in at this point with the rotor pointed at #6 post on the cap.

If you rotate crankshaft 1 rotation to put crank dot at 12:00 or cam dot also at 12:00, then that would be TDC #1 Firing/TDC #6 Overlap.

Dot to dot on the timing set is just there for cam alignment to crank at installation, people also get fooled thinking it is also the correct alignment for the distributor ready to fire #1 but it isn't. It is 1 crank revolution out.
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Old 05-11-2019, 04:25 PM
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Alright so I put my dampener line at 0° #1 exhaust stroke and point the rotor at #6

Or I can rotate it one more turn and the cam will be tdc firing #1 then I can point it at #1.

Did i get that right?
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Old 05-11-2019, 06:11 PM
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Yes that is correct.

With the timing dots lined up like they are at cam install, the balancer line should be right at matching the zero line on the timing tab. You shouldn't have to move anything to get it there.
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Old 05-11-2019, 08:58 PM
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Yea I checked it was at tdc with the timing Marks on the balancer so that's right. It's just the cam that was 180° out at install.

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Old 05-14-2019, 09:07 AM
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Got it all timed. Should be firing it up tomorrow for break in.
I also noticed the previous owner must have messed with the mechanical advance. There is one heavier spring and one light spring.
I'll be ordering a kit and tuning that in so I get a quick advance curve. I haven't messed with that at all on my last setup. Trying to make this setup perform at it's best.


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Old 05-16-2019, 07:43 PM
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So I realized today why my car wasnt firing. I pointed the rotor the wrong way. Dumb mistake. I fixed it and it fired right up. Broken in now and idles sweet

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