Engines and Components› Pistons and Piston Rings

United Engine & Machine Co

1 SET 9910HC.STD/1 SET 4000AM8.STD

$456.64

SKU: U00B 9910HCKTM.STD

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

Keith Black Claimer Pistons offer performance quality for the budget racer or street/performance applications. Hypereutectic 390 alloy with 16% Silicone. All pistons include True-Arc lock Rings which can be used with floating or press pin rod applications. Features cast in symmetrical valve reliefs, Tru-Arc Lock Rings, CNC machined pin bores, Accumulator Groove for compression ring seal, Cast in Oil Returns, Diamond Finished Skirts, Molykote Skirt Coating. Wrist pins and spiral lock included. 5/64 x 5/64 x 3/16 rings not included. Made with Chevy SB 350, Fits SB Chevy 383.
Show original supplier description
1 SET 9910HC.STD/1 SET 4000AM8.STD

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

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Specifications

BrandUnited Engine & Machine Co
Part NumberU00B 9910HCKTM.STD

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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.

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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.

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