440 Source Head Opinions?

72Duster440 said
I'm sure it's been posted in one of the 200+ replies above, but I didn't see it with a quick scan. Engine masters did a BBM cylinder head shootout.
The 440 Source heads made ~15 hp more than stock 516's, or maybe 906 head?
The Edelbrock made ~15hp more than the 440 source
and the Trick flows made ~15hp more than the Edelbrocks.

MopaR&D said
I saw that episode, very informative and basically confirms what most of us already know. Stealths are an affordable aluminum copy of iron heads with some slight improvements, nothing more nothing less.

fishmens67 said
You've got to be kidding.
A stock 516 isn't in the same universe as a Stealth head.

LocuMob said
It was a 906 head.

And every test is different depending upon the build of the engine. I think Dwayne already mentioned the same earlier.

I did a test on a 7.9:1 compression 440 where I swapped stock 906 heads for a set of ported 516 heads that flowed 250 cfm @ .500" lift. The engine went from 450 LB-FT and 387 HP to 473 LB-FT and 449 HP.

A test by someone else has nothing to do with the results you may see. Engine builders with exactly the same parts will get different results from each other.

In our shop if we only saw a 15 HP increase from a stock 906 head to Stealth heads we had a major screw up with the engine some where.