Equipped with a 4.125" big bore engine block and a 4.000" stroke forged crankshaft, this engine packs a punch! Using only top of the line components like a fully forged rotating assembly, hydraulic roller camshaft and aluminum heads, the 427" Long Block is the engine your car needs. Check out our custom options and packages below to find your perfect combination!

Block: Dart SHP 4 Bolt Mains, 9.025" Deck Height, 1 Piece Seal, 4.125" Bore
Crankshaft: Smeding 4340 Forged Steel, Internal Balance, 4.000" Stroke
Rods: Molnar 4340 Forged Steel H-Beam with 7/16" Bolts, 6.000" Length
Pistons: Icon Premium 2618 Forged Aluminum, 10.7:1 Compression, Coated Skirts
Rings: Plasma-Moly Top, Low Friction Oil, 1/16” x 1/16” x 3/16”
Rocker Arms: Smeding 1/5 Ratio, Full-Roller
Cylinder Heads: Smeding Aluminum, 210cc Intake Port, 2.08”/1.60” Valves, 65cc Chambers
Warranty: 3 Year, Unlimited Miles

Cam Specs:
540hp: .544”/.543” Lift, 236°/244° Duration @ .050”, 110 LSA
560hp: .548”/.545” Lift, 242°/250° Duration @ .050”, 110 LSA

Torque Converter: 2,400-2,800rpm Stall w/ 540hp Cam, 2,600-3,000 Stall w/ 560hp Cam Recommended

Final assembly & tuning of this partial engine must be completed by an experienced engine assembler/builder. Smeding Performance is not responsible for damaged caused by user installed parts.