flathead exhaust

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Jun 11, 2011 | 12:04 AM

1953f350

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Cross-Country

Joined: May 2011

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flathead exhaust

Looking for some ideas for my exhaust system,239 flathead,stepside box. I was thinking of making a single stack on the passenger side with a cherry bomb underneath. Currently has a big can muffler that is probably fairly restrictive and very quiet for a cool old truck.

Love to see pics of your systems out there

Jun 11, 2011 | 02:57 AM

1oldtimer

Laughing Gas

Joined: Apr 2009

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From: orange county, ca.

fentons, porter mufflers (or short glass packs) and 1.75 pipe.

Jun 11, 2011 | 04:04 AM

ALBUQ F-1

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From: NM

Quote:

Originally Posted by 1oldtimer

fentons, porter mufflers (or short glass packs) and 1.75 pipe.

As far as I know, Fenton never made any headers that would clear the steering box? I tried really hard with a set I had and gave up. Red's Headers with their extensions, Smithy's, and 1.75" pipes to the rear is where I ended up, it sounds great. Unless you take them to the rear, they are too loud and harsh IMO.

Jun 11, 2011 | 08:34 AM

tinman52

Welder User

Joined: Feb 2009

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From: northwest MT

Flatheads like the 1.75 pipe, mine is duals with glass packs and exit in front of the rear tires. No headers. Sounds great, not too loud...

Jun 11, 2011 | 10:24 AM

low54

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From: Bend, Oregon

I had smithy's on the coupe. they sound so good from the flathead...

Jun 11, 2011 | 12:44 PM

52 Merc

Hotshot

Joined: Oct 2009

Posts: 16,190

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From: Burbank, WA

I've seen different lengths of Smithy's available. From memory, I think there's a 22", 24 or 26" and a 30". I'm assuming the longer the muffler, the mellower the tone. What size are you guys runing?

Jun 11, 2011 | 03:15 PM

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

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From: NM

24 or 26, as I recall. If you use a short tailpipe, or turnouts, I've heard it really helps to use the longer ones.

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Jun 12, 2011 | 09:14 AM

low54

Elder User

Joined: Jan 2006

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From: Bend, Oregon

I ran 26" pipes, they were mounted at the transmission, gave a great tone, the pipes were pretty much straight out the back...

Jun 19, 2011 | 07:10 PM

#10

V8R

Junior User

Joined: Jan 2005

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Would 2" pipe be too big for a 276 cid flathead running a Max 1 cam and 390 cfm 4bbl? I've got Red's headers and Porter mufflers but haven't built the exhaust yet.

Jun 19, 2011 | 07:17 PM

#11

ALBUQ F-1

Fleet Owner

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From: NM

Quote:

Originally Posted by V8R

Would 2" pipe be too big for a 276 cid flathead running a Max 1 cam and 390 cfm 4bbl? I've got Red's headers and Porter mufflers but haven't built the exhaust yet.

Yes,1.75 is all they need. With 2" the sound is supposedly harsh. Even a 276 flatty just isn't that big of an engine.