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Old 05-21-2009, 11:02 PM
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Setting up msd pro billet distributer bbc

I have a 68 chevelle with .030 over 402 that I built about 12 years ago. It has a comp cam with .485 lift and .218 duration. I am swapping the intake for a performer rpm (oval port). I am also installing a holley 750 vacuum secondary carb with a proform mainbody. It has an msd 6al box. I have a new msd pro billet distributer for it and was wondering about initial timing, total timing and what rpm all the timing should be in at. I am running the vacuum advance. Any help would be great, Thanks.

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Old 05-22-2009, 12:46 PM
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Timing

I usually run mechanical advance, but I'll try to help you out. Typically, the idle timing is at or around 18 to 20 degrees, and sweeping up to 37 degrees by the time you get to 5000 revs. As of late, I've been running fixed advance at 37 degrees and have had no problems at all starting the little twirp. However, this is on a 302 chev for roadracing only, running 111 octane fuel. Your timing curve should be lower depending on your compression ratio and fuel. Setting the idle timing stait-up is always a safe bet, but a slight advance will give you better power and response. Start at zero, and work your way up little by little until it runs the way you like it. This may require setting the timing, running it around the block once or twice, then trying it again. It is all a matter of personal preference, what feels right to you. Keep your ears open for the ominous pinging, you may get it before you get it just right.
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Old 05-23-2009, 12:53 AM
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The distributor has mechanical and vacuum advance. I just run the highest octane I can buy at the pump but i know some guys that buy race fuel and mix it half and half with pump gas and was thinking about trying it. Any thoughts on that. Thanks for the reply, very helpful.
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Old 05-23-2009, 01:31 AM
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What's your final rear gear ratio? This will make a big difference in your final engine tune.

I would try "all in" timing between 47 and 51 degrees. This is with your vacuum advance hooked up to manifold vacuum, and above 3000 RPM's. Rev the engine until you get the maximum advance above your centrifugal, and vacuum advance(@steady throttle), and set your maximum total timing to 48 degrees. Lock that distributor down, and test drive it. If it ping's, drop the total timing down by 2 degrees, and test drive it again. Do this down to 38 degrees total timing.

If it is 'pinging', or getting flatter on power, you are not getting enough fuel, or your rear gear ratio is too high.
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