Engines and Components Crankshafts and Components

K1 Technologies

Forged Crankshaft, 4.25-inch Stroke

$954.52

SKU: 012-GAG-425

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Overview

The K1 Technologies Forged Crankshaft is designed for Chevrolet Big Block 454 engines with a 4.25-inch stroke. Manufactured from forged 4340 steel, it is engineered for high-stress racing applications. This crankshaft features a nitrided finish for improved strength and bearing life, large fillet radii for enhanced durability, and a straight hole oiling system for optimal lubrication. Tolerances are held to +/- .0001 inches for consistent bearing clearances.
Show original supplier description
The K1 Technologies Forged Crankshaft is a premium component engineered specifically for high-stress racing applications in Chevrolet Big Block 454 engines. Constructed from forged 4340 steel, this crankshaft undergoes a nitriding process to significantly enhance its strength and improve bearing longevity. It features large fillet radii to further bolster its structural integrity. Designed with performance in mind, this crankshaft includes a straight hole oiling system, which ensures improved lubrication to the rod bearings and helps prevent failures. The manufacturing process adheres to extremely tight tolerances, with journal clearances held to +/- .0001 inches, guaranteeing consistent and reliable performance. Each crankshaft is also magnetic particle tested to ensure it is free of flaws. K1 Technologies emphasizes quality and affordability, positioning their "race-ready" rods and cranks as a cut above standard imported components. They are manufactured to K1's specific designs and meet stringent industry tolerances, with particular attention paid to the finishing work. This crankshaft is a testament to their commitment to providing high-performance engine components for various applications, from sport compacts to big block engines.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandK1 Technologies
Part Number012-GAG-425
CategoryEngines and Components

About MOTORMIA

5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold

Buy with Confidence

Returns & Fitment

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.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy