440 Source Head Opinions?

Hallzy said

I'm skeptical of the validity of this information as well. If the Source heads only produced 15 more..the eddys 15 more again and then a cnc ported trick flow only 45 more than stock must be the crappiest cnc job in history thats pretty expensive hp in my opinion. Not exactly a good sales pitch for Trick flow either.

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It was a pretty mild cam and short block they tested on iirc, I mean 450-500 HP is not much from a 440 these days. I think they mentioned this in the episode, if they were using a bigger cam and more compression there would have been more gains with the "bigger" heads.

I think it's a useful takeaway that better-flowing heads alone won't do a whole lot for power if the rest of the combo doesn't take full advantage of the flow.