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  #1  
Old 09-23-2012, 10:59 PM
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460 BBF: dual or single exhaust?

Among a ton of other mods, I am installing a set of 3/4 length L&L headers on my 460. I am thinking about going with a 3" single exhaust to save space instead of the 2.5" true duals. Good or bad idea? The motor for now is basically stock... Performer RPM manifold, 750 carb, mild cam, straight up timing, mildly ported D3s. I plan to build up another 460 around 500hp 600tq in a year or so, it would be nice not to have to do the exhaust more than once. Any and all suggestions are appreciated, thanks in advance.
John
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Old 09-23-2012, 11:20 PM
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I would do dual exhaust if you plan on upgrading in the future.
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Old 09-24-2012, 06:48 AM
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2.5 dual with a crossover pipe about 16-18" behind the header flange
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Old 09-24-2012, 06:52 AM
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They going all the way to the rear of the truck?

on mine im running the 2"/3.5" Maddog headers fenderwell exits and that goes into 3" Pipe into a single stage Flow-master and dumps just behind the Cab.... sounds real good.... to me anyways
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Old 09-24-2012, 08:44 PM
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Is dual 2.5 enough for a mild 460?? I ran 2.5 duals into a single muffler/tail on my 302s and 351w. Dual 3s on the 351M.

After I get done moving, I'm doing a motor for the van, trying to decide on what to run under it. I have some 3 in/out mufflers, so I could run duals, or do a two into one, but would run like a 3.5 or 4 inch tail if I did a single. C
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Old 09-24-2012, 09:36 PM
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I ran dual 2.5s on my first three 460s and my h-pipe is now under Pauls b-hoe.
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Old 09-24-2012, 10:38 PM
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Just a note that have taken note of when configuring my exhaust, unless you like toasty floor boards, right under the cab is not the best place for a muffler. Hindsight generally is 20-20.
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Old 09-25-2012, 01:48 AM
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Follow link to exhaust diameter guide:
Magnaflow Technology

Duals and x pipe is best
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Old 09-25-2012, 09:56 PM
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When I was running the factory 460 manifolds I had 2.5" true duals with 40 series Flowmasters. It sounded really nice, not as loud as I would have liked but you knew it was running. I have been debating on just hooking it back up how it was, but with headers. Another option I have is a Dynomax Ultraflo dual in/dual out X-pipe muffler, I'm not sure if it will fit because of the length and the short wheel base of the Bronco. I want to make some noise but not be abnoxiously loud. Any thoughts?
John
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1984 Ford F250 XL 4wd/ 6.9 IDI/ C6/ BW1345
1984 Ford F150 4wd/ 300/ NP435/ 208
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Old 10-22-2012, 12:36 AM
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2.5" exhaust should be good for 5000rpm and down, low end torque and mid range very strong and decent top end. if turning harder around 4000rpm to 6500 a lot go 3". i run this application in my 472" bbf, solid cam ported flowed 475 to 500 hrspwr. if auto what stall converter? have ran other set ups with bigger stall converters and headers and exhaust will change as needed per rpms and weight.
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Old 10-22-2012, 12:36 AM
 
 
 
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