68-87 GM Radiator Insulators

The 68-87 GM Radiator Insulators from Prothane are engineered polyurethane bushings designed to isolate your radiator assembly from engine vibration and reduce unwanted heat transfer to the engine bay. Built for classic General Motors vehicles spanning 1968 through 1987 model years, this set of four insulators addresses a critical gap in cooling system durability and performance that many restoration and modification projects overlook. Whether you're rebuilding a vintage Chevy, Pontiac, Oldsmobile, or Buick, these bushings restore proper radiator mounting geometry and eliminate metal-to-metal contact points that accelerate wear.

Manufactured from premium polyurethane, the 68-87 GM Radiator Insulators offer superior damping characteristics compared to aged rubber or brittle OEM bushings that have hardened over decades. The black polyurethane compound resists oil, coolant, and ozone degradation, ensuring long-term structural integrity in high-heat environments. Each insulator measures 4.25 x 3.25 x 4.8 inches and weighs just 0.3 pounds, providing a lightweight yet rigid solution that maintains precise radiator core positioning while absorbing vibration frequencies generated by the engine and transmission. This material choice prevents resonance harmonics that can crack radiator fins and compromise cooling efficiency.

Mechanics and classic car enthusiasts benefit most from this upgrade when performing radiator replacement, engine swaps, or full cooling system refreshes on second-generation and third-generation GM platforms. Installation requires removing the radiator assembly and replacing the factory bushings at all four mounting points—a straightforward procedure that pays dividends in reduced vibration, quieter operation, and extended radiator lifespan. The four-piece set ensures complete coverage of all radiator support mounting locations, making this an essential component for anyone serious about restoring driving dynamics and reliability to vintage American iron.