VETTERBOB,

I'm running a 750 double pumper Holley on my 383.  Jets, primary 78, secondary 80. No choke, no vacuum. Timing 36 degrees advance. Spark retard, 4 degree. Never had a problem.

I was always under the impression that our Q-Jets were 750 CFM

But he's not running a 350 he got either a 427 or 454 which I calc out to 725 to 750 for a street engine.

Alan

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675 = 432 (427 + .030) * 6000 * .90 (optimistic) / 3456

isnt the holley street avenger a 675?

sounds like a good match to me if you want to stay holley..

ive heard good things about the street avengers

[QUOTE=cthulhu]When i was working at the local speed shop here on Saturdays it was our running joke that we could make so much more money selling 650's in 850 boxes because we always had to castrate a bigger carb to run on peoples engines because they over did it.  Mostly because they had the bigger is better mentality and had p*nis envy because their neighbor had a castrated 850 on theirs.[/QUOTE]

another problem i have seen a TON of is when people complain about their carb topping out too early..  which of course they think means their card is too small..  The first thing I do when adjusting a carb on an unknown car is adjusting the throttle.  I cannot count the number of people who complained their car had no power, only to find out they had the throttle adjusted where the pedal to the floor only had the throttle 1/4 open.

Well, I stayed with Holley and bought the Holley Street Avenger.  I installed it yesterday and made some minor adjustments I mean minor.  It pretty much just came out of the box and it worked.  I had to adjust the fuel level and the idle other than that it just worked.  I had some adjustments to the throttle linkage and the springs but once that was resolved I was done.  It has vacuum secondaries and electric choke.  What a difference from how it was running before.  I still want to get the fuel set up better but the main thing this weekend was to get it running smooth.

Once again thanks for all the help.

Jim

Well, I stayed with Holley and bought the Holley Street Avenger.  I installed it yesterday and made some minor adjustments I mean minor.  It pretty much just came out of the box and it worked.  I had to adjust the fuel level and the idle other than that it just worked.  I had some adjustments to the throttle linkage and the springs but once that was resolved I was done.  It has vacuum secondaries and electric choke.  What a difference from how it was running before.  I still want to get the fuel set up better but the main thing this weekend was to get it running smooth.

Once again thanks for all the help.

Jim

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with vac secondaries and electric choke...  it is pretty easy.. let us know how that street avenger works...  ive thought about putting one on my truck.