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Old 06-01-2020, 02:42 PM   #9
alanwoodieman
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Join Date: May 2010
Location: upstate SC
Posts: 2,962
Default Re: Rear exit manifolds for flathead 39 Ford

I have an original "police" exhaust manifold and the exhaust pipe flange is definitely bigger but as far as increasing HP by it self is questionable, exhaust gas flow better YES so maybe better throttle response and cooling
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