APRIL HOT ROD; 360 Magnums

Bill Dedman said

Interesting article. The flow information on the two differeng heads was particularly interesting, I thought. The stock-type cast iron heads were assembly-line items, not the R/T. Intake flow was only a shade over 200 cfm... I think the aluminim version from Edelbrock beat the stock heads by somehing like 50 cfm., which is about 25 persent.... Impressive, I thought.

Click to expand...

The original 300HP and 380HP crate motors had stock production heads. These engines typically dyno'd in the 320 (and confirmed in the article) and slightly over 400HP. When they stopped installing magnum engines in pick-ups and vans the crate motors switched to the magnum R/T head. These engines are advertised as 320 and 390 HP. Haven't seen any dyno numbers on them but you can expect them to be better than the crate motors with stock heads.