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Tech Question
Jeff Schliep, Duluth MN , 1967 Plymouth Fury 318 2 barrel
I have a 1967 Plymouth Fury with a 318 2 Barrel that I am using for Enduro Racing. I am looking to get a little more out of her and have been told that by adding a 360 manifold w/2bl carb it would help more so than adding a 318 manifold with a 4 barrel. Therefore what I am wondering is if the 2BBl manifold of off a 318 is actually different than a 2BBl manifold off of a 360. If they are the same then I would just have to swap carbs, if not I would have to swap carbs and manifold.
Thanks for your help, Jeff
Jeff-
Yes, the 360 manifold has bigger ports, also a bigger carb mounting pad. A worthwhile swap, wild guess: +10 HP. if you port-match the heads (if this is legal in your class), opening up the heads to match the new manifold, you might increase this to 15 HP or more. But best of all would be the 4-Bbl. All factory 4-Bbl SB intakes had the larger 360 ports. Keep in mind, though, for what it sounds like you are doing with the car, mid-range torque, off the corners, is the key to winning. The upshot: Keep the 4-Bbl on the small side (600-650 CFM.)
Rick
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