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My , I wouldn't put headers on an outhouse. Absolute trash with no measurable gain on a street motor.
If your drag racing and need to get every scrap of hp available , sure go for it and they will increase hp but be prepared for leaks , excess heat , fried wires , etc etc



I dont know what headers you use but I have never had any of them problems. In fact the headers on my sons Dart have been on the car since 1997 and have never leaked or blew a gasket or burnt a wire. The same with my 63 as I have no problems at all using headers. They make much better headers now with thick flanges then the junk back in the 70's with paper thin flanges. I will take headers any day over manifolds on a performance car. Unless I ran a class where the rules make you run manifolds I will take the hp and use headers. Ron