Hardcore 427 Specs
Displacement: 427 ci
Bore/stroke: 4.125x4.000 inches
Compression: 10.0:1
Weight: 435 pounds
Cylinder heads: Aluminum Motown 220cc (PN 024150A-2), 64cc angle plug
Valves: Manley 2.080/1.600-inch intake/exhaust
Head gaskets: Fel-Pro (PN 1004)
Balancer: Pro Race (PN 24265)
Carburetor: Hardcore 870-cfm Hi Flow (PN 217-25133)
Intake manifold: Edelbrock Super Victor (PN 2925)
Ignition: Hardcore HEI (PN 216-85306)
Wires: Taylor 8mm (under header)
Cam: Crane hydraulic 244/252 degrees duration at 0.050-inch lift, 0.515/0.525-inch lift
Valvesprings: 1.437-inch diameter dual
Rocker arms: 1.5 ratio, Harland Sharp 0.150 offset rollers (intake)
Pushrods: Manley 4340 one-piece
Lifters: Speed Pro hydraulic
Timing chain: Manley Street Roller (PN 73163)
Valve covers: Motown chrome (PN 070721)
Oil pan: Milodon Street/Strip (PN 30908)
Oil pump: Federal-Mogul
Block: Motown 9.025/4.125
Crankshaft: Scat/Eagle 4340 4.00-inch stroke
Connecting rods: Eagle H-beam 6.0-inch with L-19 bolts
Pistons: JE/Wiseco forged -20cc reverse dome
Rings: JE moly 1/16, 1/16, 3/16 standard tension
Bearings: Clevite H-series
Balance: Internal
Cost: $8,995.00
Warranty: Two-year limited
The Mouse That Roared
Bill Mitchell Hardcore Racing's 427ci Mouse features pump-gas friendly compression, aluminum heads, and a svelte weight of only 435 pounds. Producing more than 540 hp and 523 lb-ft of torque (see "427 Dyno-Test" sidebar), this is a stout package indeed. Horsepower peaked at a low-stress (for a small-block) 6,000 rpm. The big-inch Mouse produced 1.24 horses per pound while the big-block was only able to muster 0.95 horses per pound. On paper, the Mouse looks better, but will torque tip the scales in the favor of the big-block? More important is the power-to-weight ratio when installed in the vehicle. The Mouse-equipped SuperNova features a power-to-weight ratio of 6.14 pounds per horsepower. With the 509 nestled between its fenders, SuperNova sported a superhero-like 5.76 pounds per horsepower.
 The fact that we were able...  The fact that we were able to drive the SuperNova all the way to LACR with the small-block is testimony to the mild nature and reliability built into the Bill Mitchell Hardcore Racing crate motors. |  |  Alan Grove components makes...  Alan Grove components makes this trick mid-mount alternator bracket for both big- and small-block (shown) long-style water-pump setups. It's super rigid and tucks the alternator out of the way. |