Prothane 7-509 GM Early Truck Polyurethane Engine Mount Kit 1963-1972

The Prothane 7-509 is an application-specific polyurethane engine mount kit designed for early GM trucks from 1963 to 1972. Unlike generic universal mounts, these mounts are engineered to precise factory dimensions for a proper, confidence-inspiring fit and improved performance over worn or soft OEM rubber mounts.

Prothane's polyurethane compound is significantly firmer than stock rubber, which helps limit engine movement, reduce drivetrain slop, and improve power transfer to the wheels. The reduced flex also decreases the likelihood of mount failure, keeping your engine securely positioned under hard acceleration or demanding driving conditions.

Key Features:

• Application-specific engineering for 1963–1972 GM trucks — not a universal fit
• High-durometer polyurethane construction for improved durability over OEM rubber
• Limits engine travel to reduce drivetrain slop and improve power transfer
• Poly-locked "run-safe" design helps prevent catastrophic mount failure
• Sold as a pair (2 mounts included)
• Direct bolt-in replacement — no modifications required

Whether you're building a street truck or pushing your classic GM hard on weekends, the Prothane 7-509 engine mount kit provides the support and reliability your drivetrain demands. The included "run-safe" poly-lock feature adds an extra layer of protection, ensuring the engine stays secured even under extreme stress.