Tech Bulletin: USRA B-Mods
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January 9, 2020

On January 9, officials from the United States Racing Association made an amendment to the 2020 USRA B-Mod rules.

In Rule 13.8.10, World Products Part #043600 and #042670 were added to the list of permitted aftermarket GM steel stock replacement heads.

Download the 2020 USRA B-Mods rules from the USRA website at

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