Re: [Classic Mustang] Carb - 570 or 670 cfm?

Yeah, that's what Summit said, too. Holley insisted the 670 would be
better, but heck, I don't like hitting 5500 with it! The car does 90 at
3500rpm, so...

The manifold is an Edelbrock 2750; that's the only one still made so far as
I know. It sits a bit higher than the standard Ford manifold so I *might*
have clearance issues with the ram air system, but I think it'll go in one
way or another. I picked up a really nice one on Ebay for $90 (inc
shipping) and that's about $145 cheaper than the cheapest place I can get
it new.

At 03:12 PM 10/10/2008, Walt Boeninger wrote:
>So to be clear, you have a 351C-2V with a 2V carb
>and you're putting a 4V manifold and carb.
>..... I should remember what you have....
>(What manifold did you get, since it used to an oddball..)
>
>I assume you've not planning on racing or spinning this
>over 5K a lot.... I would think the 570 is just fine
>for a 351C-2V headed motor....the 4V heads have huge ports
>compared wi
>
>Dan O'Reilly wrote:
> >
> >
> > OK, one last carb question. 71 Mach, 351C. I'm upgrading from 2V to
> > 4V. Got the manifold already (thanks, Ebay!!!) for a great price. What
> > I'm waffling over is the size of the carb. I'm going with a Holley Street
> > Avenger, and the question is: 570 or 670 cfm? From Holley's charts, the
> > 570 should be good up to the 5000rpm range, with the 670 recommended
> > past that.
> >
> > Any recommendations? I can buy a factory refurbed (and warranted) 570
> > right now for $100, but I don't want to under-carb the engine.

---

Dan O'Reilly
1971 Bright Red Mach 1
2002 Black Deluxe Convertible
Colorado Springs, CO

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