Clevite H-Series Connecting Rod Bearing - 0.010 in Undersize - Narrowed - Big Block Ford Neck Braces & Supports it means that these are

it means that these are not suitable for open-top car racing or for karting

Heavy-duty triple shielding

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New design features two choices for horizontal bar placement

Inserts restrict air/fuel entry and reduce power slightly to prevent wheel spin and range in size from 0

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