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If your motor is stock, I would stay with the manifolds. That is unless they are warped, or rusted bad. When I put headers on my stock 352 I felt that I lost power. But I have recently bumped up my cam and the headers really help now.
CACWBY...your dynomax story sounds just like mine. I finally got a big enough dent to allow for the sterring box, and rearranged the tranny linkage, and made them work, but they never did seal well. They have a bad surface for sealing. Why did they leave that "lip" there?
I may try to grind down that "lip" and use these on my leftover truck. Since it's headers have rusted clean through..
Headers...are they really worth all of the trouble.
Has anybody made the cast 406/427 headers work? I like that idea, but understand that some motor mount clearance problems occur in trucks.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.