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1948 - 1956 F1, F100 & Larger F-Series Trucks
muffler sizing?

1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

muffler sizing?

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Old

Sep 7, 2007 | 01:04 AM

#1

John - NNY

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Joined: Oct 2005

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muffler sizing?

Is there a formula to figure out what size mufflers to use. I have two small glass packs on my 337 flathead. I think the exhaust might be a bit restricted. I would also like to quiet it down a bit. I am using the stock iron exhaust manifolds. The current exhaust has just one 90 degree bend and then about 8 feet of strait pipe. The glass packs are in the middle of the 8 foot run. I would like to replace the the strait pipe and glass pack with stainless.

John
NNY

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Old

Sep 7, 2007 | 07:47 AM

#2

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,283

Likes: 1,046

From: NM

"Regular" 239 flatheads seem to sound and run best for the street with 1-3/4" dual exhausts. Are your glasspaks straight-thru, short ones? I doubt they are a problem.

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Old

Sep 7, 2007 | 08:22 AM

#3

GreatNorthWoods

Lead Driver

Joined: Apr 2002

Posts: 8,813

Likes: 13

From: Littleton, New Hampshire

Agree, the only glass packs I've ever seen were straight thru. Don't see how you could have any exhaust restriction with those...

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