The Smeding Performance 427" Mighty Mouse combines a heavy-duty 4-bolt main block, forged 4340 steel rotating assembly, hydraulic roller camshaft, and high-flow aluminum cylinder heads to deliver outstanding street and strip performance. With exceptional torque, responsive power delivery, and a 3-year unlimited-mile warranty, the Mighty Mouse is ready for whatever you throw at it.

Call the Smeding Performance sales team today and put 560 horsepower in your project.

Block: Smeding Heavy Duty 4 Bolt Mains, 9.025" Deck Height, 1 Piece Seal, 4.125" Bore
Crankshaft: Smeding 4340 Forged Steel, Internal Balance, 4.000" Stroke
Rods: Smeding 4340 Forged Steel H-Beam w/ ARP2000 7/16" Bolts, 6.000" Length
Pistons: Custom 2618 Forged Aluminum, 10.5:1 Compression, Coated Skirts
Rings: Stainless Steel Top, Napier 2nd, Low Friction Oil, 1.2/1.2/3.0
Camshaft: Smeding Hydraulic Roller, .549”/.546” Lift, 242°/250° Duration @ .050”
Rocker Arms: Smeding 1.5 Ratio, 3/8" Stud, Full-Roller
Intake: Holley Strip Dominator Single Plane
Cylinder Heads: Smeding Aluminum, 210cc Intake Port, 2.08"/1.60" Valves, 65cc Chambers
Warranty: 3 Year, Unlimited Miles

Torque Converter: 2,600-3,000 Stall Recommended