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Old 03-01-2015, 05:54 PM   #13
1972BlueC20
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Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
Re: Holley Carb Help

Quote:
Originally Posted by geezer#99 View Post
I run 14 initial on an almost stock 305. Just has headers on it with a stock quadrajet.
I ran a much healthier sbc a few years ago that liked 22 initial (at 3500 foot elevation) but wouldn't run more than 18 initial when I moved to sea level.
Ok so I checked the timing again. Its at 12 btdc. Idle was at 910 rpm in park, in drive it was 650 rpm.

I drove it with the advance plugged off completely and the hesitation was much less. Still there a little but much better. However I'm sure it's getting much worse mpgs like that.

It was hard to check total timing because I was by myself and had to accuate the throttle with my hand while looking at the timing light. It seemed to be around 30-32 degrees at 3k rpm. I need to go back and read the engine manual to see what rpm they recommend to check total timing.

I dropped the idle to 850 in park, which made it 650 in drive. The idle speed in drive doesn't go down equal to the amount I drop it while in park.

What do you think?
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1972 Chevrolet C20 Cheyenne Custom Camper LWB - 350 / 330 HP GM Crate - TH350 / Mild Shift Kit - Dark Blue / Medium Blue - Paint Code 559
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