$$2,200.00Engine \ Crankshafts \ 4340 Forged CrankshaftsSMO21A-MG
CALSMO21A-MG
Callies SMO21A-MG Magnum Crankshaft Small Block Chevy, 4 in. Stroke, 2.1 in. Rod Size, 400 Mains
After years of service, Magnum crankshafts by Callies have established themselves as one of the most durable competition crankshafts ever produced. Magnum crankshafts are manufactured from ultra pure AISI 4340 steel. Callies then subjects this material to multiple heat treatments, resulting in a crankshaft with unsurpassed wear and strength ...
CalliesSMO21A-MG Magnum Crankshaft Small Block Chevy, 4 i

Callies

Callies SMO21A-MG Magnum Crankshaft Small Block Chevy, 4 in. Stroke, 2.1 in. Rod Size, 400 Mains

Item #: CALSMO21A-MG

Mfg Part #: SMO21A-MG

Applies To Continental U.S. orders only

Specifications
Crankshaft Specifications
Rear Main Seal Style
2-piece
Engine Stroke (in)
4.000 in.
Crankshaft Material
Forged 4340 steel
Engine Balance
Internal
Lightened
Yes
Requires Narrow Bearings
Yes
Rod Bearings Included
No
Main Bearings Included
No
Rod Journal Diameter (in)
2.100 in.
Main Journal Diameter (in)
2.648 in.
Crankshaft Snout Style
Big Block Chevy
Balancer Bolt Thread Size
Custom
Quantity
Sold individually.
Applications
Make
Chevrolet
Engine Family
Chevy small block Gen I
Engine Size
6.6L/400
Years
1970-1980
Crankshaft to Flywheel Attachment
6-bolt
General
Brand
Callies
Item #
CALSMO21A-MG
Mfg Part #
SMO21A-MG
Description

After years of service, Magnum crankshafts by Callies have established themselves as one of the most durable competition crankshafts ever produced. Magnum crankshafts are manufactured from ultra pure AISI 4340 steel. Callies then subjects this material to multiple heat treatments, resulting in a crankshaft with unsurpassed wear and strength characteristics. All Magnum cranks feature Callies Ultra-Case heat treatment. Each Magnum crank will have gun drilled mains and fully profiled counterweights, regardless of engine type. A typical 4.000 in. stroke Small Block Chevy will weigh less than 48 pounds. Magnum crankshafts are available for a variety of engine types.

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