Seller notes

Ford 302 351C Cleveland Anodized Aluminum Main Girdle Only Speedmaster alloy main girdles are machined from 6061 T6 billet aluminum that creates an additional main web structure to strengthen your block's main webbing. The forces of higher rpm and power-adders can overwhelm main bearing caps and fasteners, causing the caps to walk, fastener threads to fatigue, and your main web to crack! Speedmaster main cap girdles dampen the harmonics that caused the main caps to move in the first place and ef...

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