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Old 08-04-2012, 06:53 PM
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Yes it would! lol I was thinking of going with 3.73's or so, I'm not sure if I want to go as high as 4.10's cuz I plan on drifting this thing and don't want to run out of gear in the middle of a drift. As far as the vacuum advance... I have an MSD e-curve dizzy so I just need to program it in but I'm not sure what I would want to go with so I just went with "mechanical" to get a 15 degree curve. Whats confusing is that with the e-curve you set the total timing and then use the switches inside of the dizzy to dial it back to get your initial timing. I don't quite understand what to expect from the "vacuum advance" which is also selectable with the switches inside the dizzy. It knows to apply additional "vacuum advance" by using a map sensor in the dizzy so all you need to do is connect the vacuum hose and it will apply the vacuum advance curve that is programmed with the switches. I'm just confused because I understand that I set the total and then set the initial with the switches, if I select a vacuum advance curve I'm not sure what to expect the initial timing to be... maybe I should contact MSD and have them explain that to me a little better.

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Old 08-04-2012, 06:56 PM
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Originally Posted by Caballerokid View Post
This is good information.

So what about a shorter duration cam, say 218 @.050" but with a tight LSA 106? Is the burn still going to be sluggish at idle? I ask because thats what I have and I have my timing at 19 initial, no vacuum adv and total thats about 37-38 all in at 3k. I bumped it to 3,500 rpm but dont notice much of a difference. Btw I have a saginaw 4 spd with 2.73s for now. I haven't yet but was wondering if going to 2500 rpm would make a difference. Its a heavier car GMC caballero 78' (el camino). Also, would you recommend higher initial timing if the engine will tolerate it? thanks
Here's some info on timing and advance. The page was originally written about the GM HEI distributor but the timing info is universal.
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Old 08-05-2012, 03:57 PM
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Thanks Cobalt! That is alot of GREAT information. I did alot of reading through it.

This is what came of that information. Holley 4777-2

Last edited by Caballerokid; 08-05-2012 at 04:26 PM.
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