So our 540" Extreme isn’t a big enough big-block for you? Let us introduce the 572" Extreme...Over 700 rampaging horsepower and 700 traction-annihilating lb/ft of torque, all on pump gas! Have we got your attention? Mixing all of the right severe-duty parts into a potent, streetable combination, along with precise machining and balancing, all hand-assembled with the skill of more than 30 years of craftsmanship, you have an engine that makes more normally-aspirated power with a single 4v carb than any pair of tires can hold. And to prove this power, each and every engine we produce is broken-in, tuned and tested on our in-house dyno, so you have a guarantee of power and durability.

Block: Dart Big M, 4.630" Bore, 9.8" Deck Height
Crankshaft: Smeding 4340 Forged Steel, Internal Balance, 4.250" Stroke
Rods: Smeding 4340 Forged Steel H-Beam with 7/16" Bolts, 6.385" Length
Pistons: JE Forged Aluminum, Dome, 10.25:1 Compression
Rings: Plasma-Moly Top, Low Friction Oil, 0.043" x 1/16" x 3/16"
Camshaft: Smeding Hydraulic Roller, .614”/.614” Lift, 253°/263° Duration @ .050”
Rocker Arms: Scorpion 1.7 Ratio, 7/16" Stud, Full-Roller
Intake: Edelbrock Victor Jr. Single Plane
Cylinder Heads: Smeding 360cc Intake Port, 2.30"/1.88" Valves, 120cc Chambers
Warranty: 3 Year, Unlimited Miles

Torque Converter: 2,600-2,800rpm Stall Recommended