Callies Performance Products began manufacturing high performance crankshafts in 1989 with a commitment to excellence in manufacturing and the highest level of customer service possible. Every Callies crankshaft is 100% inspected for critical dimensions. Each rod and main journal fillet is manufactured to .125 radii to ensure durabality. Their precise production efforts deliver more accurate dowel pin placement, indexing, stroke length and a perpendicular crank flange. Concentricity and surface finish are the two most desireable features in a high performance crankshaft journal. Each journal must be perfectly concentric to its specified centerline, and journal surface lobbing. Callies limits theirs to no more that .00006" to further enhance oil film integrity at high engine speeds.

• 4340 Forging
• Dura-Tough
• Completely machined in Callies' shop
• #1 & 4 rod journals Angalite drilled
• Typical SB weight 51 pounds

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Lunati Sledgehammer Crankshafts

Lunati now offers the new Sledgehammer Crankshaft Series. These cranks are designed for street/strip applications, where Lunati quality counts. Best of all, Sledgehammers are 100% US made, making them a better value than weaker overseas products.
Sledgehammer cranks can be installed right out of the box, due to a factory-applied protective oil coating. They are forged from 4340 non-twist steel, and are 100% US made. This non-twist design produces a crankshaft with higher tensile strength, unlike the cheaper overseas models. All pin arms are edged and detailed, and counter weights are clearanced for 5.700” connecting rods—features usually found only on premium model crankshafts.

Use the Sledgehammer in popular small block GM applications. See the chart below for application details and specs.

Key Features and Benefits

Forged cranks for the budget-minded racer
4340 Forged non-twist from US steel, for 100% US manufacturing
Nitride heat treated and sonic cleaned
Held to all GM specs
Comes with a protective oil coating
Mallory added to improve balancing
Pin Arms edged and detailed