The C4 has a large engine bay

With its technology and manufacturing abilities, gm could easily produce a physically small and light fair displacement V8 to weigh no more than the current ls1/2 and be capable of producing more output than either one of them, with the same, or even lower displacement, while requiring slightly less fuel to do so.

The usable torque that pushrod engines have comes from their lower state of tune(cant revv as easily) and larger displacement. Give a dohc head the same displacement and it will consume the same fuel and breath better at partial throttle(also, the higher intake velocity at partial throttle and lower revvs contributes to a better fuel atomization and more effective pumping in general)and produce more torque everywhere, therefore more power everywhere. This equates to greater EFFICIENCY, more power from the same displacement and consumption, or the same power from less displacement and less fuel consumption.

"Most of the engines used in hi-performance race cars and race boats today, are modified from the engines designed for Detroit production automobiles in the 1950s and 60s.

The engines are based on an overhead valve head design with two valves per cylinder, driven by a single camshaft in the block through varied arrangements of tappets and push rods.

Granted, when first introduced, they were a far cry better than Henry Ford’s Flathead engines, that were in Vogue at the time, but not in step with modern day engine technology.

The American Auto Industry, once known for its world leadership, got left behind with the introduction of more efficient, four valve per cylinder, dual overhead cam engines, built in Europe and Japan.The valve train in Schubeck engines, closely relate to those Mercedes and Honda race engines.

Compare the similarities between Schubeck engines and the engines winning at Lemons and Indy. Starting with the valve train, for example, newer engine designs all use overhead cams proven to be less stressful by doing away with problems related to push rods and tappets. Fewer moving parts mean less reciprocating weight. Less weight helps the valve train operate in all rpm ranges with less effort and more efficiency.

Adding to a more relaxed valve train are the smaller and lighter valves and springs, also requiring less spring pressure to operate. Four valves over two valves per cylinder, affords a greater ability for the engine to breath, thereby increasing the volumetric efficiency for more power.

Topping today's list of reasons for performance engine failures, are broker valve train components. All because they are overstressed. Schubeck's solution to this problem is obvious and simple. Reduce the stress."