The stock head is so massive, I can't imagine needing an aftermarket other than the Bling .. anyone having heat probs.
ORIGINAL: jadda
I have the NOVA and crazy nut head.
Nova: didn't run cooler then stock, is smaller then stock, but it's nicer.
Crazy nut head: Runs a lot cooler then stock, is bigger.
So I don't use the nova head any more.