Beginning with a GM Performance Parts LSX iron block bored to 4.125 inches, Rex Horst and Richard Reyman installed a totally forged rotating assembly consisting of an Eagle 4-inch crank, H-beam rods and Wiseco pistons with Ackerly and Childs rings. For those that recognize the numbers, that adds up to 427 cubic inches, the same as a C6 Z06, but Dave had much more in store.
After the bottom end was assembled with Clevite bearings and ARP fasteners, the top end of the engine came together as Richard Reyman at West Coast Cylinder heads used ARP studs to fasten on a pair of Stage 2.5 CNC-ported L92 cylinder heads fitted with titanium valves and Patriot springs. A Comp camshaft was installed with Durabond bearings and was linked to the valve through Cadillac CTS-V roller lifters, hardened pushrods, and CHE Precision-modified roller rockers good for 10,000-rpm. At this point, Dave had the makings for a serious 7.0L V-8, just like a Z06, but the supercharged ZR1 Corvette had just been unleashed on the supercar market, and Dave already had felt the surge or torque that can only come from a supercharger. There was only one solution— a Magnacharger TVS 2300 supercharger, the same one you'll find on a ZR1, was bolted to the long block. However, unlike the ZR1's 10 psi feeding its 6.2L, Dave's 7.0L inhales 15 psi of boost thanks to a carbon-fiber jackshaft that overdrives the supercharger via an ATI 10-rib V-belt drive and Metco idler pulley.
An engine that large consuming air at over twice atmospheric pressure will need a lot of cool air and a lot of fuel to work to its potential, so the Magnuson heat exchanger built into the manifold got some help from an AlkyControl methanol injection system that sprays air directly into the custom Spectre polished aluminum intake. The systems senses boost from the Map sensor and begins to spray methanol at 4 pounds of boost and is progressive to apply more methanol as boost increases. The cooling effect of the alcohol combined with its octane-boosting properties allows for more aggressive ignition timing to fully wring out the horsepower from the engine. The methanol tank replaced the windshield washer fluid tank, but kept the sensor, so when the system is running low, the low washer fluid light on the dash will let Dave know it's time to top it off. The fuel injection also received some reinforcements, as 72lb-per-hour injectors are fed a steady stream of high-pressure fuel through an ingenious fuel system. The stock tank uses a Walbro 225 fuel pump that sends fuel to a 7-gallon surge tank in the rear of the truck. The surge tank uses an Aeromotive Eliminator fuel pump capable of supporting 1,400 hp. Two Aeromotive filters screen fuel for particles down to 10 microns before being sent to the Aeromotive fuel pressure regulator under the hood.