Originally Posted by A12
Some of the horsepower gain can come down to how well the HP exhaust manifold port is matched to the cylinder head port (and gasket). Guess how much hp you gain by just doing that on a stock '69 440 6BBL to a stock HP cast iron manifold and nothing else? catfight Nick's a good......make that a great guy up

First mod I did to my new '69 383 Road Runner back in the summer of '69 was put a set of Hooker Headers on it and they never came off even after "cooking" I don't know how many starters. Never dyno'd it but seat of the pants there was never any doubt there was a performance and HP gain and more than a few tenths better at the drag strip.

Thanks for posting Nick's video! Enjoyed it and all of the other videos he does, stand up guy IMO up..............................Nick should have done a special Moparts only version and LOST horsepower with the headers, panic laugh2

Mike




Nick actually has a video that evaluates go fast goodies but in reverse. He started with a healthy street built 440 that had an RPM intake, headers and a holley carburetor. He dynoed it as such. Then he swapped headers for manifolds and tested it. Swapped RPM for iron OEM intake. Then a carter in place of the Holley. With stock parts the engine made noticeably less power but he said he would prefer the lower output with factory parts over higher output with aftermarket parts. I like him and his channel.

Keep old mopars alive.