KB Pistons Performance Hypereutectic SB Chevy Flat Top Lightweight Piston Set - 4.040" Bore - 3.480" Stroke - 5.700" Rod Length

Modern piston design locates the top ring higher for improved performance. a high top ring operates at higher temperatures and requires a larger top ring end gap. To find the proper ring end gap, multiply your bore size by the ring end gap factor listed on the chart (i. e. , Street Normally Aspirated 4. 000" bore x . 0065" gap factor = . 026" total top ring end gap). Your hypereutectic performance piston will expand less than typical cast or forged pistons. Because of this and the wear characteristics of the hypereutectic alloy, you can run tight piston?to?wall clearances. NOTE: Hypereutectic piston engines will require 2?4 degrees less total ignition timing. One key to top performance is to have all cylinders longing for the same timing numbers. Equal air flow, fuel mix, quench, chamber temperature, swirl, and compression at each cylinder work to this end. The following standards are used on all kb hypereutectic non?coated pistons. On 4. 000" to 4. 100", std sizes have . 0005 clearance built into the piston (example 4. 00 bore block, std piston size will be 3. 9995). This allows you to hone std block to attain the . 0015 minimum clearance required in the application Chart. All other oversizes have the minimum clearance built into the piston (example 4. 030" bore block, . 030 piston size will be 4. 0285, . 0015 min clearance).

Created from a high-silicon aluminum alloy, KB Performance pistons are lightweight to improve throttle response and RPM changes while still being strong enough to withstand high compression and high temperatures. Each piston is engineered with race ready features like high upper compression-ring locations, gas-accumulator grooves, drilled oil returns, and spiral-lock retainer grooves. KB Performance pistons are available for many popular engine makes and displacements. They also come in a variety of compression ratios to suit your performance needs. Have a look through our catalog and find the piston that meets your needs and wants today!UEM is committed to being a world class producer of cast and forged piston applications. Product quality is one of our core values, as well as one of our key business strategies. UEM operates a documented Quality Management System in compliance with ISO 9001:2015. As part of this commitment, our team is focused on upholding the eight principals of QMS. The automotive aftermarket is about using the cars we have and fully utilizing that resource until its life is met. On the race side it is about innovation, performance, and winning. We believe in what we do and the pistons we make. We love providing prosperity to our employees and reliable mobility to our customers. We love the communities we serve and to be part of an industry that values the responsible use/reuse of our resources.

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