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Reverend, slightly off topic. I have an 80's 318. would one of these earlier closed chamber heads benefit my low rpm mileage effort. I would not want to redrill my intake but one of the other ones?



I'd use magnum heads for a mileage setup. Interesting thing with my 360, I have inverse domed KB hyper pistons sticking .004-.005" out of the deck with mopar magnum R/T heads. On the dyno I started with 36 degrees timing and it made 382 hp. Taking the timing down to 32 and it was up to 388. Tight quench with the magnum chamber is apparently very efficient. Car was getting 14 mpg with 3.91 gears and not what I'd call a light foot. 3100 lb challenger. 294 hp to the wheels. 904 transmission. Only difference from the chassis dyno to the engine was crap kinked 2.5 inch exhaust and E body chassis headers to circlie jerk headers through the dyno's 4" pipes.
Anyway, know it's off topic, but it might help some people...