Ford 351C Cleveland Head Gasket Modification - 5/32 Hole Drilling Diagram

This document is a scanned excerpt from an automotive reference describing a head gasket modification for the Ford 351C (351 Cleveland) engine. It includes a diagram of the cylinder head gasket viewed with the front of the engine indicated by an arrow, showing where to drill a 5/32-inch diameter hole. The dimensioned drawing locates the hole approximately .80 inch and 2.00 inches from reference edges of the gasket. The accompanying text explains that for extended high-rpm usage, such as road racing or circle track competition, cylinder head gasket durability can be improved by drilling this 5/32-inch hole in the illustrated location. The document explicitly notes that the modification is not required for drag racing applications. Readers can learn the exact hole size (5/32 inch), its approximate placement relative to the front of the gasket, and the intended use cases (sustained high-rpm road/circle track racing versus drag racing). The scan was uploaded to a 1972 Ford Ranchero gallery as part of a set of 351C/Cleveland engine reference documents; while the document does not state a model year, the 351C engine reference is consistent with that era.