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Old 07-02-2004, 10:23 PM
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Question about changes i made on my holly carbs???

on my 350sb, i have 2-450cfm mec sec carbs.. i just changed my jets from #60 to #58 and i had 5.5 power valves and i went to 3.5 .... reason why i changed the jets was i had a small puff of black smoke when i hit the gas,and my mixture screws was out about two turns out,.so i knew it was a little rich.., I changed the power valves because someone suggested i should because they always ran 3.5.. so i did... i havent drove my car much because of health problems,but now it has more black smoke when i hit the gas... the car runs good,but im wondering if i should put the 5.5 valves back in. my vacuum is between 9-10 pds in gear. i smell more gas now. im thinking the power valves might be dumpping more gas in then needed...before i changed anything,the car ran great,but had a small puff of black smoke. what do ya'll think???

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Old 07-03-2004, 07:46 AM
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Going to a lower number power valve should have leaned it at part throttle conditions or at any time the engine is above 3.5 inches of vacuum. I`ve always set my carb up to what power valve was suggested by the book for my vacuum reading. So if it`s still rich even with the lower number valve then I`d say the problem lies elsewhere, maybe going to a 1 step leaner fuel squirters would solve the problem or going 1 step leaner on the jet sizes. We played with dual quads once, and after all the hassle they required of tuning, we went back to a single carb set up and life got a lot simpler.
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Old 07-03-2004, 09:55 AM
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You might be right, but its more richer now then before i missed with it.. I drove it for about 2 months before i ever missed with it,and i noticed a small puff of black smoke,thats why i missed with it. maybe one of the power valves i put in might be missed up and dumping to much fuel in, i dont know,but i know its worse now then before , im going to go back with the 5.5 ..the squritters i have in are #31 thats what came on the carbs.. i have played with them to before,and the #31 seems to work best..
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Old 07-03-2004, 10:49 PM
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Hey i would try a 6.5 power valve.Every thing ive read on the holley suggest going 2 or 2.5 lower than your vacum reading.
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