A four core radiator only cools properly if it is held square and clamped at the right angle, and the standard two and three core lower support will not do that. This is the heavy-duty lower piece, stamped on AMD tooling so it indexes to the factory holes without drilling or trimming.

Auto Metal Direct 349-4067-2H Lower Radiator Support Features:

• Fits 1967-1972 Chevy and GMC C10, C20, C30, K10, K20 and K30 trucks.
• Fits 1969-1972 Chevy Blazer and GMC Jimmy, and 1967-1972 Suburban.
• Lower position retainer, correct for heavy-duty four core radiators.
• Heavy gauge steel with reinforced welds and a corrosion resistant coating.
• Indexes to the original mounting points, no drilling or trimming required.
• Restores proper radiator angle and clamp force for full airflow through the core.