"We're calling it The Hellcat Killer", says Mike Petralia, owner and chief engine builder at Hardcore Horsepower & Dyno in Franklin, TN. "It's a BBC designed for your classic GM muscle car or truck to run down those pesky late model tug boats. And it'll beat 'em with a carb, or EFI, on pump gas, and without the need for any boost or chemical power adders". This daily drivable-engine will be the new King of the Streets because of its hydraulic roller cam too. And it'll fit in just about any old iron with maybe just a small hood scoop. Trucks and Tri-5s are no problem.
For this build Petralia relied on the proven strength of a Dart Big M Sportsman block. It features Ductile Iron splayed 4-bolt main caps and vastly improved oiling over factory GM blocks with a true priority main oiling system. It has stepped oil galleys to increase flow to the crank at higher rpms and a front oil crossover that eliminates internal oil leakage around the distributor. No need to worry about distributor shaft o-rings with these blocks. Blind head bolt holes keep water from mixing with the oil. And a 2-pc rear main seal makes oil pan selection plentiful. Dart performed all the machine work on the block including boring it to 4.600-inch followed up with a torque-plate hone finished for Plasma-Moly rings. They also finish-milled the decks true and parallel to 9.800-inch for a Mr. Gasket Co. composition-type head gasket. And they installed all the cam bearings, brass freeze plugs, and locating dowel pins for the oil pump and timing cover too.