HP exhaust manifolds

Terry Hauck

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I am building an RV 440 for my 69 Roadrunner. It will be a mild street build with about 10.5 comp, 509 cam, 906 heads. Because of starter and power steering header clearance I am thinking of using my stock HP exhaust manifolds. Thoughts and suggestions please. Thanks
 

Russ69Runner

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Those should be fine. Watched a video of a guy who tested header's then the HP original manifold's and the HP's made more House power. Would use 2 1/2 exhaust pipes going out the back form the Manifold's. Dual's of course.
 

Terry Hauck

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I watched that episode of Nick's Garage. He compared HP manifolds, Max Wedge manifolds and Hooker Headers. The headers were #1, Max Wedge #2 and the HPs were last. Headers and max wedge were close like 5 horses but the HPs lost 50. I might have to rethink my plan. Another thing is my headers are Doug's 1 3/4 for a 383. Probably should go with 1 7/8 with a 440. Comments please.
 

quikbird

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1 7\8 will work fine. They also acid dip the internals of the stock headers as well to thin them from the inside in f.a.s.t. Class.
 
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