440 source heads on a stock 440

I respect other's opinions. Here are mine and the reasons why.

I think he said he doesn't have any heads. Stealth heads OOTB will out flow any stock iron head buy 30-40 cfm in his lift range. Factory iron @ .400" lift, 210-220 cfm and Stealth @ .400" lift, 240-250 cfm. These numbers came off the same flowbench.

And as to the iron versus aluminum debate, I present these dyno tests.

Comparing Aluminum And Iron Cylinder Heads - Car Craft Magazine

Iron vs. Alloy Engine Heads - Tech Article - Chevy High Performance Magazine

Please note that in one of tests the testers found their suppositions (iron will make more horsepower over aluminum at the same compression ratio because of aluminum's heat transfer rate) to be in error and still denied their own test results! In both cases the aluminum heads made more power. Old wife's, er, mechanic's tales die hard.