Prothane 7-507-BL GM Large Clamshell Polyurethane Motor Mount Kit - Black

The Prothane 7-507-BL is a complete black polyurethane motor mount kit engineered specifically for GM V8 applications using the large clamshell-style mount. Constructed with high-performance polyurethane and a zinc/black-finished steel shell, this bolt-in replacement mount delivers a firm, precise engine connection that outperforms soft factory rubber in every measurable way.

Why Upgrade to Polyurethane?

Over time, OEM rubber engine mounts deteriorate, crack, and tear away from their brackets. This causes excess engine movement, increased noise and vibration, and diminished power transfer. Prothane's polyurethane construction resists degradation and firmly controls engine travel to keep drivetrain geometry consistent and maximize power to the wheels.

Key Features:

• Application-specific engineering — designed to exact OEM specifications, not a universal fit
• High-performance polyurethane construction — firmer and more durable than factory rubber mounts
• Steel clamshell housing with zinc/black finish for corrosion resistance
• Poly-locked "run-safe" metal interlock — internal safety interlock prevents catastrophic engine separation even under extreme use
• Black color with graphite additive — the graphite content in black polyurethane helps reduce the potential for squeaking
• Sold as a kit — hardware included for a complete bolt-in installation
• Made in the USA
• Lifetime warranty against defects in materials and workmanship for the original purchaser

Prothane recommends applying the included pre-lube grease during installation to ensure quiet, long-lasting operation. For a performance-oriented or high-output GM V8 build, the 7-507-BL is a direct, confidence-inspiring upgrade over worn or stock rubber engine mounts.