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The bolt holes shown at A, B, and C are where the late-model LT1 350ci engine motor mounts adhere. The extra hole (D) allowed engineers to move the motor mount rearward to provide clearance for the Impala’s air-conditioning compressor.
Planning For Power - Pro Touring 1981 Chevy El Camino

The bolt holes shown at A, B, and C are where the late-model LT1 350ci engine motor mounts adhere. The extra hole (D) allowed engineers to move the motor mount rearward to provide clearance for the Impala’s air-conditioning compressor.  View Related Article