Forged Small Block Chevy Rotating Assembly-421 Flat Top-400 Main-6 Rod

America's Oldest Speed Shop®. Forged Small Block Chevy Rotating Assembly-421 Flat Top-400 Main-6 Rod. Scat 4340 Forged Steel Crankshaft. Straight shot and chamfered oil holes.

Nitride hardened and shot peened. Lightening holes in all rod throws. Large radius on all journals. KB Signature Series Forged Pistons. 4.000 bore pistons available in standard.

4.125 bore pistons available in. Speedway 4340 H-beam Connecting Rods. Full floating pin in silicon bronze bushing.

Precision bolt bushings to positively locate cap. Weight matched set of 8 rods. King HP Series Main & Rod Bearings.

0.015 thick top layer for superior macro particle embedability and conformability. 40 Vickers hardness to resist overlay migration and extrusion. 450°F heat threshold for superior protection against friction and overheating.

Mains are 3/4 grooved for improved oiling to the rod journals. Bi-metal aluminum silicon alloy featuring fine micro-bore finish.

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!

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. 415/421-ci SBC (3.875-inch stroke).

4.155 x 3.875 inches. Excellent value for the price.

By rocket on February 22, 2017. Most parts were decent quality. Yes, I recommend this product.

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Forged S/B Chevy Rotating Assy. 434 Flat Top, 350 Main Journal, 6 Rod. 434 Flat Top, 400 Main Journal, 6 Rod. Forged Small Block Chevy Rotating Ass.

434 Dome, 350 Main Journal, 6 Rod. 434 Dome, 400 Main Journal, 6 Rod. Labor To Side Clearance Rods and Balance Rotating Assembly, 434 Kit. Please pay for all items at the same time. We cannot combine your order if you have already paid. Not sure this part will fit? Speedway Motors is Americas Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 65 years. Repack the item in a sturdy box, include a copy of your invoice and complete the form on the back of the invoice. All exchanges need to have reshipping charges included. Speedway accepts full responsibility for the accuracy of our listings and product representation. The item "Forged Small Block Chevy Rotating Assembly-421 Flat Top-400 Main-6 Rod" is in sale since Wednesday, July 01, 2015.

This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Engine Rebuilding Kits". The seller is "speedway_motors" and is located in Lincoln, Nebraska. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Colombia, Panama, Jamaica.

Brand: Speedway Motors
Manufacturer Part Number: 9151272-STD