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I just purchased a 1979 Ford F 350 extended cab Trailer Special. The engine is a 460 and the transmission is a C6.
The 460 runs great, however, both stock exhaust manifolds sound loud. The sound does not appear to be coming from the donuts.
I do not see any cracks on the outside. The exhaust sounds like it is leaking on the back side or underneath.
How can I fix this? Does anyone make a shorty header for this application? Any help would be appreciated. Thanks guys.
Fred
 

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First, grab a welding glove, start it up, and feel for where the leak is. Shut it down and look at the spot you found with a mirror. You should know exactly what's wrong then, and what options you may have to fix it.

David
 

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For some reason the 460 was notorious for cracking the exhaust manifolds. I've seen at least half a dozen.
 
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