Originally Posted by power2weight

Is this a joke? Fully assembled LS1 heads weight 25lbs. My B234F head weights 65! Unless DOHC valves are moved magically, there will be buckets or rockers and lifters, and twice as many. Half of a pushrod lives below the block deck, further reducing CG. DOHC motors put the weight at the worst part of the motor.

It would never be a "couple of thousands of an inch" that is just laughable.

I tell you what, measure the 4.2 width valve cover to VC, I'll do the same to my LS1. I'm happy they fit the 4.2 in so many places, but how much power does it make?

Cadillac's DOHC motors fit in the corvette's engine bay, except for they only displace 4.6L and make shitty comparable power. Not even supercharged do they approach LS7 horsepower levels. The Corvette is the perfect example of why OHV's still have their application.

"Efficency" is like ricer math HP/Liter. Garbage. The only factor that practically matters when weighed against power output is weight, hmmmm power to weight ratio. And by the way, the LS7 heads flow 360 CFM, no DOHC need there.