Originally Posted by an8sec70cuda
Any power loss doesn't compare to the weight loss of aluminum heads. There is no downside to aluminum heads. twocents



That and the fact that the cast iron stuff is well over 40 years old and quite simply used up!

I run 10.6:1 CR with aluminum in my 505 and it will run on the cheapest pump swill out there. Don't typically do it, but it can if I need to.

The best part was sending them off for cnc porting for well under $1k and getting back heads that flow better than the OE Max Wedge head.

As for timing, I have a little knob inside the cockpit that I can adjust it on the fly, so I have some flexibility. grin

I have over 7,000 miles on a set of aluminum heads and there have been zero downsides.

'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.