LS7 vs M156 vs S65

LS7=7 liters, 505 hp=72.14 hp/ltr (used in ZO6)

M156=6.2 liters, 518 hp=83.54 hp/ltr (used in CL 63 AMG)

M156=6.2 liters, 474 hp=76.45 hp/ltr (used in CLK63 AMG)

S65=4 liters, 414 hp=103.5 hp/ ltr


Even with 32 valves, four camshafts, variable valve camshaft timing and phasing and variable intake geometry, the very best Benz can do is 503 horsepower with a so-so 456 ft/lbs of torque! The LS7--an engine that has it's roots in a post WWII Cadillac V8 pushrod engine--generates 505 horsepower and 470 ft/lbs of torque. A pushrod engine generates more power and horsepower than a variable-valve V8 DOHC engine that has 32 valves, variable cam phasing at both the intake AND exhaust, costs almost $40,000 by itself, and has had nearly a billion research euro's thrown at it?
The DOHC engine is just more refined and advanced than the LSx engines from Chevy. Sure, the Chevy engine makes more power, but it does it through brute force, not engineering. The only thing Chevy does is make a big-bore engine and throw pushrods at it, so there's no wonder it makes more power: through displacement and not through technology, like the DOHC engines.

If a company like Mercedes Benz (or BMW) were to bring a big-displacement DOHC engine to market, Chevy's pushrod V8 would be history! I mean, just think about it. DOHC advancements with large displacement? Now that would be one powerful engine!

Mercedes and BMW did exactly that--created a large-displacement DOHC V8-- and it still falls short of the Almighty Pushrod's glory! It's still weaker, has less horsepower, costs far more to manufacture and most important of all, has a very irregular powerband.

BMW and Mercedes Benz strategy is to add as many expensive technologies on an engine to try and boost power and flatten the torque curve; Chevrolet's strategy is to refine and tune the LSx engine to the point of perfection in order to get that ultra-wide powerband. Titanium con-rods, forged aluminum pistons and sodium-filled intake valve can't hurt, of course...

so I wanna ask that is the pushrod engine mightier then the DOHC V8 or the DOHC needs some more improvement to overcome LS legends?