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Old 12-13-2009, 05:31 PM
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Downsize carburetor

I have a 57 272 Y-block with a 1406 600 cfm Edlebrock carb that works ok but is a little boggy....
I am getting my engine rebuilt and my engine guy says that I should really only have a 1403 Edelbrock 500 cfm carb on it. Can I get new jets and springs and downsize my 600 cfm carb or is it too much trouble?

Thanks for your help.

Gt

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Old 12-13-2009, 06:00 PM
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No trouble at all, Gordie Tó What's the calibration on your 1406?
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Old 12-13-2009, 08:10 PM
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you can't "downsize" a carb by changing the jets
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Old 12-13-2009, 08:26 PM
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Jetting it down won't make it flow less cfm, just lean it out. The only way to "downsize" is a smaller carb. The jetting changes the fuel only, it's independent from the air flow.
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Old 12-14-2009, 01:22 PM
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I agree with the motor guy, it'd be more responsive with the 500cfm. You can rejet/metering rod in the 600 but the air would be a little lazy going thru it because the venturii size is bigger. It is better to have air moving quicker thru the carb (remember, at 'X' mph the same amount of air will have to go thru the carb regardless if 500 or 600cfm), it is the pressure of the air moving thru the carb that control fuel rate and flow. The 500 cfm will have a much stronger signal. At wide open throttle the 600cfm would be better, but them 'Y' blocks would complain a lot if you go WOT for very long and carb size would be academic.
I do love the sound of those motors, sweet. Hope this helped, oj
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Old 12-14-2009, 04:24 PM
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Thanks for the good advice. Anybody want a good 1406? Anybody have a good 1403? My pistons showed up today with everything but my cam. Should have her rebuilt by the holidays if the cam comes.

Gt
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