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

Well, I tend not to run much over 4500 RPM. I turn 3000 RPM at 75mph, and
at 95 I'm still well below 4000. If I manually shift my FMX (something I
love about that tranny), I can do 2-3 shift at 65 and still be only about
3800. I do have a high-flow inlet (I have the ram-air system) and a 2.5"
exhaust, but I have stock headers as I'm trying to keep stock as much as
possible. I do think the 570 is probably the best carb for that setup, yes?

As for jetting, the only custom jetting I'm concerned with right now is for
altitude. I typically run between 6000 and 7000 feet around here, so I'm
getting it jetted down 3 sizes (each size = 2000 feet of altitude).

At 08:01 AM 10/15/2008, Dennis Ouellette wrote:
>A 570 CFM carb will give you more torque because the velocity through the
>smaller barrels is at a higher rate of speed at lower RPM than a larger
>carb. A large carb will give you more HP at high RPM because it can flow
>more air. Also, unless you are running an open high-flow air intake
>system, and a free-flowing exhaust (headers, 2.5" pipes, etc.) the larger
>carb won't do much for you. Be sure you can get a jet kit with several
>different sizes. Each engine is different (compression, cam, etc.) and
>jetting can make the difference between a mediocre running engine and
>economy and one that runs strong and gets good MPG.
>
>Let us know how you make out.
>Regards,
>Dennis
>68 J code fastback

---

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

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