Re: 4bbl or 2bbl

therood wrote:

Real question for anyone who's run a car with and without headers: Do they add any power?

In my (very brief) experience doing PR for an exhaust company, it seemed like any gains you would actually make were (A) excruciatingly small and (B) usually near the top of the rev range. In other words, the power gains would be mostly theoretical for how most teams run their Lemons engines (Unless you have that one guy who always wrings the engine out to factory redline to make the pass at the end of the straight). The marketing people could still say "Adds up to 10 HP" because while a B18A1 will indeed breathe better at 6600 RPM, if your drivers are revving the aforementioned B18A1 to 6600 RPM every shift, it's not going to make 10 (or 3 or whatever) more ponies for very long.

I realize that isn't categorical and that some exhaust manifolds are SUPER restrictive, but it always seemed silly to think that it was the one thing that was holding you back. Mostly, they just seem to make the car sound a little better and much louder, which is extremely unfun if you're driving a race car for over an hour.

Have you seen explorer 5.0 exhaust manifolds?

Silent But Deadly Racing- Chief cook and bottle washer, Ricky Bobby's Laughing Clown Malt Liquor Thunderbird Turbo Coupe, Datsun 510, 87 Mustang (The Race Team Formerly Known as Prince), 72 Pinto Squire waggy, Parnelli Jones 67 Galaxie, Turbo Coupe Surf wagon.(The Surfin Bird), Squatting Dogs In Tracksuits, finally a B class winner.

Besmirching race tracks in the Eastern US since 2001

Re: 4bbl or 2bbl

Is totally not putting a little 390 Holley 4bbl on an NA 2.3 Ford.