Provides clearance for a 4.125” stroke with steel rods Includes all necessary hardware, pick-up tube, gaskets, and internal baffle sheet

Provides clearance for a 4.125” stroke with steel rods Features two 3/4” NPT drain back ports Includes all necessary hardware, pick-up tube, gaskets, and internal baffle sheet

Our 4.125" LS crankshafts are engineered from a 4340 billet steel alloy, forged using non-twist technology, and shot peened to reduce surface stress. Each crankshaft is heat-treated to increase tensile strength and nitrided for enhanced surface durability. The reluctor wheel comes pre-installed for easy setup. LS 4.125" 6-Counterweight Crankshaft: 4.125" Stroke 6-Counterweight Design Gun-Drilled Main Journals Standard LS Wet Sump Snout 4340 Forged High-Tensile Alloy Rated for up to 1,300 hors...

Built from a 4340 billet steel alloy, this 4.000" LS crankshaft is forged using non-twist machinery, shot peened to reduce stress, heat treated for strength, and nitrided to resist surface wear. Each crankshaft comes with a pre-installed reluctor wheel for added convenience. LS 4.000" 6-Counterweight Crankshaft: 4.000" Stroke 6-Counterweight Design Gun-Drilled Main Journals Standard LS Wet Sump Snout 4340 Forged High-Tensile Strength Alloy Rated for up to 1,300 horsepower Average Weight: 53 ...

Clears 4.125” stroke with steel connecting rods Includes two 3/4” NPT drain back ports Kit includes hardware, pick-up tube, gaskets, and baffle sheet

These LS 6.125" H-Beam rods are built from a high-strength 4340 steel alloy billet, shot peened to reduce surface stress, and heat treated for increased tensile strength. They feature a durable bronze-bushed wrist pin and include SP8740 7/16" fasteners, making them ideal for high-performance applications. LS 6.125" 4340 H-Beam: 6.125" Length Center-to-Center 4340 Forged High Tensile Strength Alloy Bronze Bushed .927" Wrist Pin 2.100" Precision Honed Crank Pin SP8740 7/16" Rod B...

Designed to clear up to a 4.125” stroke with steel connecting rods Includes all necessary hardware, pick-up tube, gaskets, and internal baffle sheet

Compatible with most common chassis configurations Clears up to a 3.622” stroke with steel connecting rods Includes all hardware, pick-up tube, gaskets, and internal baffle sheet

Rectangle Port R1: .615”/.615” valve lift with 1.7 rocker 229/242 duration @ .050” 112 LSA with 4° advance Rectangle Port R2: .618”/.615” valve lift with 1.7 rocker 233/250 duration @ .050” 113 LSA with 5° advance Rectangle Port R3: .622"/.622" valve lift with 1.7 rocker 240/252 duration @ .050" 112 LSA with 4° advance Rectangle Port R4: .624”/.615” valve lift with 1.7 rocker 245/256 duration @ .050” 113 LSA with 5° advance Rectangle Port R5: .622"/.622"...

Turbo R2: .615”/.610” valve lift with 1.7 rocker 229/232 duration @ .050” 114 LSA with 4° advance Turbo R3: .624”/.615” valve lift with 1.7 rocker 243/248 duration @ .050” 114 LSA with 2° advance

255cc intake, 95cc exhaust, 69cc chambers Virgin A356 aluminum castings 6-bolt head casting with reinforced decks Advanced 11° valve angle for maximum flow and piston-to-valve clearance 2.165” intake valve (21-4N alloy) & 1.60” exhaust valve (23-8N super alloy) 0.210" intake free drop & 0.250" exhaust free drop 23-8N alloy delivers high-temp performance like Inconel without brittleness Available complete with chromoly or titanium retainers, or bare with valves Bille...

Cathedral Port R2: .617”/.614” valve lift with 1.7 rocker 231/236 duration @ .050” 112 LSA + 4° advance Cathedral Port R3: .621”/.615” valve lift with 1.7 rocker 235/244 duration @ .050” 114.5 LSA + 4.5° advance

Precision CNC porting: 260cc intake, 100cc exhaust, and 69cc combustion chambers Premium Virgin A356 aluminum construction Reinforced 6-bolt head design for superior durability Optimized 11° valve angle for peak airflow and piston-to-valve clearance High-performance 2.165” intake valves (21-4N alloy) & 1.60” exhaust valves (23-8N super alloy) Generous valve free drop: 0.210" intake, 0.250" exhaust 23-8N alloy offers Inconel-like heat resistance minus the fragility Options available: full...