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Old 05-27-2004, 07:27 AM
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Calling Pontiac Perfomance Gurus

Need total timing spec for the following:
71 Lemans 350
Mild cam/Headers/2-1/2" exhaust/#62 heads/ 9.0:1 c/r
Mallory Unilite points conversion w/ MSD 6AL

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Old 05-28-2004, 11:58 AM
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Old 05-29-2004, 12:26 AM
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Been, with the 62 heads your compression ratio is higher than 9:1, it's actually closer to 10.50:1. Set your initial around 12 degrees btc, then hool up the vaccum advance and bring the engine up to around 2500-2800 rpms and see what your total timing is. The best for this combination should be 34-36 degrees total.
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Old 06-01-2004, 06:30 AM
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The heads cc'd at 72 ccs exactly. I think it was Scottys that gave the c/r based on the head gasket thickness, deck height and cc's. The pistons are plain old stock flat tops w/ valve reliefs.

Also, the guy that did the distributor change over, took out the vacuum advance unit. Still stick with 34-36 degrees?
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Old 06-01-2004, 10:11 PM
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Been when Pontiac built the 350 HO's they had casting 48 heads (Ram Air III's) on them and were rated at 10.5:1. As far as taking out the vaccum advance did he give a reason for it? I have never ran any engine in my GTO without it and run a total of 38 degrees with the cam I have in it right now. Did he by any chance lock out the advance? Myself I would use the vaccum acvance and a Mr. Gasket advance kit and set the total timing to around 34 degrees total. This should make the street manors alot more liveable. If possible give me some more info when you get the chance.
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Old 06-02-2004, 07:05 AM
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I am assuming that the guy locked out the vacuum advance. I think I'm going to play with it tonight, as I am also working on my car (65 Chevelle)too. I'm going to set total advance at 38 degrees and see where static comes in. The owner is working nights now, and doesn't have any time on the weekends to help. Sounds like his car will be delivered to his house in "AS IS" condition, if he doesn't come around soon!

The thing that throws me is the MSD, and the unilite. Just a little unsure.



Jeff
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