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Old 05-02-2013, 05:23 PM
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running rich

i know some body can help me out here ive got a 468 bbc 320 cc heads comp cam 292 and 312 duration 527 lift open plenum intake 750 quickfuel carb just plain jane i can get this down to about 26 to 30 degrees initial timing after that it runs crappy 35 to38 advance timing street fire msd distridutor got heavyist springs installed burns real rich at idle but better at higher rpms havent got on street yet but running on about couple ah hundred yard dash got about a 700 rpm idle but sounds like popping through exhaust iam just lost thank you

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Old 05-02-2013, 09:31 PM
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You need to check the manifold vacuum, run as much initial timing as possible, but to get your total where you want it 36-38*, you might need to re-curve the distributor, you can also clean up the idle by changing out the idle air bleeds on the carb.
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Old 05-02-2013, 09:35 PM
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check float level first.
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Old 05-03-2013, 05:59 AM
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use a 4.5 power valve due to low engine vacuum.

use lot of timing at idle with a cam that big. After setting the timing, set idle speed to 1000 rpms then adjust the idle mixture screws for max rpms.
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Old 05-03-2013, 06:48 AM
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how much timing are you suggesting right now it runs good at about 25- 28 degrees initial bigger air bleeds or smaller how about drill holes in butterflys more air
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Old 05-03-2013, 10:02 AM
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30 degrees at idle is good. 40 total mechanical. Plus another 10 from the vacuum advance if the engine can make at least 10 inhg going down the highway.

I put a 0.090" hole in both front blades. Seems to work well.
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Old 05-03-2013, 10:48 AM
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carb

i noticed after i took carb off to drill .090 holes in butterflies that the primary butterflies are cracked open quite a bit how much space should there be it looks like 1/16 of a inch how do i fix that if its to much thank you
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Old 05-03-2013, 11:04 AM
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You first need to get your your transfer slots set properly. Pull the carb and look to see what you have for a gap on the t-slot. Then make sure your fuel pressure is set correctly, then check the float levels. Why drill the butterflies when you can change or drill the air bleeds?
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Old 05-03-2013, 12:13 PM
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does anyone have a suggestion on a good sparkplug to run maybe brand and number
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Old 05-03-2013, 12:17 PM
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carb

33willys77 think maybe got primary t- slot figured out after drilling butterflies not open as far as they were idling about 700 rpms but still have that rich smell thats why asking about plugs maybe what kind what gap setting
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