'383' ~ 1967 325 HP vs. 1968 330 HP vs. 1968 335 HP

Eddie Blay,

According to Mopar. With all things being equal, the #2843906 Cylinder Head
could put out {+11 HP} over the #2406516 Cylinder Head in a 'stock' 383 Engine
measured at 4800 RPM's

Up to 2800 RPM's, there was no significant difference in Horsepower.

But, at 3000 RPM's the increase in power started to develop.