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Old 09-12-2010, 07:53 PM
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Carb jetting help

i just just recently traded for a 1966 VW rat rod with a pretty heavily built 350on it. when i picked the car up i noticed it was burning a little rich. it has 2 4bbl holley carbs onit and a 6 to 8 in weind intake with a 3 to 4 in spacer. i have been trying to identify the carbs and i think they may be 450 cfm. No matter what i did to the air flow mix it still ran fat. so i looked at the jets and it had 209 jets in it. So now i know that it was probably meant to run on methanol or alcohol and that the guy who had it did not know what was going on my main question is where should i start with putting in jets so i can run it on 91 octane or so. thanks

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Old 09-20-2010, 11:50 AM
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Just take a trip to O'reiley auto parts and pick up an Adjust-A-Jet kit, made by holley (part # 55001HOL) made for 4150/4160 carbs. The next thing you can get is a jet assortment kit (pt.# 36-181). It has 2 each of 36 different jet sizes from #64 to #99. My guess is it is less than $15....may be wrong but its worth a shot

Check out youtube to see the how-to videos on Holley carbs. Just type in 'Holley Carb anatomy' and it will show you where to get to the jets from.

Hope this helps

Last edited by shadowdiver307; 09-20-2010 at 11:55 AM. Reason: part number fix
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Old 09-20-2010, 03:43 PM
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If you get that jet kit for under $60 it's a steal. $15....30 years ago lol
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Old 09-20-2010, 07:23 PM
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X2

You can find off brand sets for ~$50, but the finish and quality isn't up to BG or Holley, etc. standards.

You know somethin' good's going on when the guy says the engine is "on" the car- not "in" it!
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Old 09-20-2010, 07:30 PM
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Quote:
Originally Posted by shadowdiver307
Just take a trip to O'reiley auto parts and pick up an Adjust-A-Jet kit, made by holley (part # 55001HOL) made for 4150/4160 carbs. The next thing you can get is a jet assortment kit (pt.# 36-181). It has 2 each of 36 different jet sizes from #64 to #99. My guess is it is less than $15....may be wrong but its worth a shot

Check out youtube to see the how-to videos on Holley carbs. Just type in 'Holley Carb anatomy' and it will show you where to get to the jets from.

Hope this helps
Excellent response.
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Old 09-21-2010, 09:08 AM
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@techinspector1- Thanks
@bubbahotep- Ya I've never bought jetting stuff so I had no idea how much it would cost lol
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Old 09-25-2010, 02:50 PM
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the "on" comment is dead on lol....i put a set of 65's in it and it seems to have leaned it out enough to quit killing plugs anyway thanks for the help
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