I have a F4B for sale if anyone is interested. I also have a cast iron 2V 289
intake. Make and offer.
Duke
B382002037
---- Thomas Witt <atwittsend@verizon.net> wrote:
> Interesting..., I put the garden variety Performer side by side with the
> often sought after F4B. I also threw in the Stock intake as a comparison to
> the winner in each of the RPM ranges. Hopefully the format will display
> correctly with the plain text requirement. Based on this test:
>
> Performer vs F4B (and Stock intake comparison)
>
> RPM HP difference (gain) Stock (over/under PFR vs F4B)
> 2750 F4B 1.9 + 3.1
> 3000 PFR 4.0 + 4
> 3250 PFR 0.4 + 1.9
> 3500 F4B 2.8 -6.7
> 3750 F4B 0.5 -8.2
> 4000 F4B 4.4 -11
> 4250 F4B 1.7 -13.9
> 4500 PRF 4.2 -18.6
> 4750 F4B 4.1 -23.8
> 5000 F4B 9.2 -19
> 5250 F4B 30.7 -21.5
>
> The stock manifold was best up to 3250 RPM.
>
> The Performer and the F4B see-saw back and forth. Up to 4750 RPM there is
> no more than a 4.4 HP difference.
>
> The Performers greatest benefits seem to be at 3000 and 4500 RPM.
>
> The F4Bs greatest benefit is above 4750 RPM with a noticeable 30.7 HP gain
> at 5250 RPM.
>
> An interesting final note is that the F4B never hit the maximum HP the
> Performer did (233.7 at 4500 RPM). The F4B topped out at 231 HP at 4750 RPM.
>
> Conclusion (based on these test):
>
> The Performer or F4B are an improvement on the stock intake from 3250 and
> up RPMs.
>
> The difference between the Performer and F4B are only about 4 HP up to 4750
> RPM.
>
> The Performer actually beat the F4B in total HP by a small amount (2.7 HP)
> and at a lower RPM.
>
> The F4B was the clear winner above 4750 RPM offering as much as a 30.7 HP
> gain at 5500 RPM. Note, while I use the term "gain" it is more like
> "sustain" in that the HP did not drop off as much.
>
> Tom
>
>
>
>
>
>
>
>
>
>
>
>
>
> ----- Original Message -----
> From: <wsamouce@kc.rr.com>
> To: <tigers@autox.team.net>
> Sent: Tuesday, April 27, 2010 11:38 AM
> Subject: [Tigers] Small-Block Intake Manifold Survey
>
>
> > Not sure if this is a repost or not.
> >
> > Great artical from 1988 on comparing 10 intake manifolds to include the
> > "Cobra/F4B" and the "Tiger/low rise".
> >
> > I am happy to say that I have a Weiand 7515 on my 260 and it makes the
> > most power.
> >
> >
> >
>http://web.archive.org/web/20080415204031/http://www.jason.fletcher.net/tech/intakes/intakes.htm
> >
> > Duke
> > B382002037
> > _______________________________________________
> > Tigers@autox.team.net
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> > Unsubscribe/Manage:
> > http://autox.team.net/mailman/options/tigers/atwittsend@verizon.net
> >
>
>
>
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