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Engines and Components› Crankshafts and Components

Chevy

Cast Steel Crankshaft, 4.250" Stroke, External Balance, 2-Piece Rear Main Seal

$480.00 $370.80 Save $109.20

SKU: 1-276-021

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In Stock
Ships by Aug 1
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Description

The Speedmaster 1-276-021 crankshaft is constructed from durable cast steel, making it a reliable choice for Chevy BBC 454 applications. This crankshaft is precision-ground and micro-polished to exacting tolerances, ensuring optimal performance and longevity. Key specifications include a 4.250" stroke, a 2-piece rear main seal design, and external balancing. Speedmaster cast crankshafts are presented as a suitable option for enthusiasts looking to upgrade or rebuild their engine with quality components.

MIA's Description

The Speedmaster 1-276-021 is a cast steel crankshaft designed for Chevy BBC 454 engines. It features a 4.250" stroke, a 2-piece rear main seal, and external balance.

Fitment

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Specifications

BrandChevy
Part Number1-276-021
CategoryEngines and Components

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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