318 Cam

Plymouth Power said
I was wondering what camshaft to go with, I have a 1973 318 all original with less than 70,000 miles on it. It will have a 4bbl on it and I am planning to put it into my Duster it has the (guessing) 2.76 gears in the back, in a (fact) 7.25. I want something that will also be able to keep up with the later addition of a Six-Barrel and an 8.75 with 3.23's or 3.55's haven't decided yet. I want something that will give me power and torque, things like fuel economy and cost don't matter. Thanks for all of your help.

If you are looking to keep the internals and rotating assembly the same and have a gear ratio of 3.23-3.55, you can make use of Comps XE262 or XE268 cam. They will both give good low end torque and make power throughout the rev range. They will work with a stock converter, but the later works best with a 2300+ converter. You will need the matching Comp valvesprings as well. Being that as it stands with the stock bottom end, compression will be around 8.0:1. With that said, it probably isn't a good idea to run a Six pack carb setup without higher compression and cyl head modification. It would drown the motor. If you were to up the compression, I'd go with KB167 pistons (preferrably zero decked) and either install 1.88/1.60 valves in the existing heads, or do the same to 302 casting heads. If that is not in the cards and you want to maintain the stock bottom end, I would search for an LD4B intake or Edelbrock Performer intake and use either a 600 cfm Eddie carb, or 650 Holley.

With the stock rotating assembly, one of the two cams mentioned, 3.23-3.55 gears, and one of the carb and intake setups listed (including headers), mid to high 14s should be easily obtainable with good tuning. This should put you in the 265-290 hp range, roughly 320-330 ft lbs of torque and yield decent mileage.

-Justin