Re: [AMC-List] AMC Spirit questions

[Mark Price <markprice242@xxxxxxxxxxxx>]

Anyone ever get an "official" cfm reading on the Holleys off of 327's???
They sure appear to be very much 390 cfm carbs.
I've got two of these carbs + a couple of true 390 cfm holleys.
I should figure out which ones to keep and which ones to sell off.
None of them are in ready to run condition of course. That would be too easy!
--
Mark Price
markprice242ATadelphia.net
Morgantown, WV


---- Tom Jennings <tomj@xxxxxxx> wrote: 
> On Fri, 20 Oct 2006, John Elle wrote:
> 
> > SNIP
> > and a Jeep Weber conversion, or a 2bbl-4bbl adapter
> > and a Holley 390.
> > SNIP
> > This done on the stock engine can give an inexpensive boost for the buck
> > 'specially when done with a cam. I prefer a Carter AVS or AFB my self
> > between 350 and 400 cfm
> 
> John, all your comments are good. I have a question on yr carb
> ideas above.
> 
> What Carter AFx carb is 350 - 400 cfm?
> 
> There doesn't seem to be many "performance" carbs (I use that
> word loosely) in the under-500cfm range. The Holley 390 (but
> Holleys seem to need constant fiddling for reliable treet use
> (not their intended use)) and the Webers are about it; the BBDs
> are fine too except for the limited adjustability.
> 
> But the smallest AFB I know of is 500cfm, and the AVS, isn't
> that old, unavailable, and 600cfm-ish?
> 
> PS: Here's a small chart of rpm vs. engine CFM for 258 ci,
> assuming 80% VE (I hope it's better than that!):
> 
> RPM	CFM
> 1000	60
> 1500	90
> 2000	119
> 2500	149      <---
> 3000	179
> 3500	209
> 4000	239
> 4500	269
> 5000	299      <---
> 5500	328
> 6000	358
> 
> The two arrows are of course likely cruise RPM and max RPM
> (stock small AMC, 70's). 2500 is perfect for the little YF,
> which is sucked dry at speed. Dual YFs would be nice! :-)
> 
> A 500cfm carb on this motor would be unhappy unless you're at a
> track at WOT most of the time, and even there it's a bit large.
> The Holley 390 is at least sized right.
> 
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