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Old 04-09-2010, 01:21 AM
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292 chevy carb

I have a chevy 292 in my 1950 chevy pickup. I was wondering how the old engine would perform with a 670 CFM 4BBL vacuum secondary Holley carb?


See it at: http://holley.com/0-80670

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Old 04-09-2010, 06:59 AM
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not great.. 4bbl would be ok, but you would be better off with a 390 CFM vac secondaries
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Old 04-09-2010, 10:43 AM
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ok, I just had the 670 handy and was looking from more power from the old engine... but i guess it goes back to the old saying: There's no replacement for displacement...
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Old 04-09-2010, 11:31 AM
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you can get more power out of it. 292 is a really good engine, but the 670 is just a little too much carb.. mild cam with a decent amount of compression ( not sure what it is stock ) and headders will probably give the power you want. along with an exhaust note unlike any V8..
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Old 04-09-2010, 06:37 PM
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What is the highest CFM carb you could put on one without over killing it?

Last edited by QParker; 04-09-2010 at 11:53 PM.
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Old 04-16-2010, 03:43 PM
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Highball

If you are talking about a 292 inline six, go to "www.Cliffordperformace.com" and see what they have to offer. I have a buddy with a '66 Chevy with a 292 six with a four barrel and it is impressive. He also runs headers and a reworked head.
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Old 04-16-2010, 04:07 PM
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Quote:
Originally Posted by QParker
What is the highest CFM carb you could put on one without over killing it?
550-600 CFM 4bbl..
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Old 04-16-2010, 04:53 PM
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I'll take the contrarian point of view. Being a vacuum secondaries carb, the secondaries do not come into play until the motor makes enough vacuum to open 'em. That may or may not happen at all with that motor. It might run for the rest of its life on the primaries and never crack the secondaries open at all.

Operating at 80% volumetric efficiency (sounds about right for a more or less stock 292), the motor will draw 337 CFM at 5000 rpm's. Assuming the 670 has the same size throttle bores and venturies front and rear, this means that the motor would do this 5000 rpm burst on just the primaries. See what I mean?

Bolt the 670 on there and let 'er rip.

I will agree with Matt about a 390 though. I have run 390 4-barrels on several straight sixes and they are the perfect carb to use.
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