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

muffler sizing?

   
Old Sep 7, 2007 | 01:04 AM
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John - NNY's Avatar
John - NNY
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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.

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Old Sep 7, 2007 | 07:47 AM
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"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
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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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