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How to balance rotating assembly

how to balance rotating assembly

Forged Small Block Chevy Rotating Assembly, 421 .283 Dome, 400 Mains, 6 Rod

Item XXXXXXXX is on BACKORDER. We will ship it when it becomes available. Press "Continue" to add this item to your cart.

What's in the Box

Speedway introduces forged rotating assemblies, with an optional balance job. Includes new 2-pc rear main seal crank, rods and pistons. Cranks are new so they use standard size bearings.

All Scat 4340 cranks are 2-piece rear main seal, internally balanced and weigh approximately 51-55 lbs. All balancing is done with our state-of-the-art Hines balancer by race mechanics with over 30 years of experience! A kit purchased with the optional balance job will ship in 24-48 hours. These rotating assembly engine rebuild kits may require additional charges for heavy metal.

If you are going to run this crank in a sprint car motor, you must have the crank flange turned down prior to balancing the crank to allow it to go through the motor plate.

NOTE: A balance rotating assembly option is currently not offered for this package but the proper balancing service can be determined after your order is placed. If you would like our balancing option service for 395 and 421 engine builds, please call 1-800-979-0122 when placing order.

NOTE: Piston rings are not included and must be purchased separately. Use Style E rings.


  • 415/421-ci SBC (3.875-inch stroke)
    • Displacement: 421 ci
    • Bore x Stroke: 4.155 x 3.875 inches
    • Compression: 10.7:1
    • Rod: 6.00-inch

Category: Forex

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