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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