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Old 08-07-2012, 01:27 AM
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Originally Posted by Caballerokid View Post
Thanks to Cobalt327 for posting some helpful timing information in another post, here is where I am right now.

I adjusted the accel pump cams and the adjuster bolt. Added a 10 vacuum advance curve starting at 10" of vacuum and all in by 4" of vacuum and I hooked it to ported vacuum as I am already running 19 initial advance. I changed the mechanical timing curve to 15 all in by 3,000 rpm. Drove it and it drove well and responded well but had a lean spot off when cruising just off idle and cleaned up with more throttle. I went home and (until I get another set of discharge nozzles) put my .036" squirter on the primary and the lean spot was GONE! Ya, its a little rich now but I need to go down to about a .032" squirter and all should be great until I get better gearing and will have to do this all over again

So here is the e-curve timing; 19 initial, 15 mechanical (by 3,000), 10 vacuum advance 10" in by 4". Math says a total of 44 but it's really about 45-46. Also Spinn I'm not using the rubber o-ring seals on the inside, just the top gasket. I haven't had any problems at all with it. Just understanding it more as it works backwards from a conventional HEI dizzy.
Good job sticking to it until you got it sorted out.

I really am a fan of the 4777 Holley- I believe it's one of the most flexible carbs out there and it can work well in a wide variety of situations. I have had one on engines as far apart as a 0.030" over Pontiac 455 (ran mid 12's) to a '68 Pontiac Sprint OHC 250 ci 6 cylinder inline engine (originally had a Q-jet from the factory). I used the 4777 while I did my first Q-jet rebuild!
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