The steering shaft features a tapered spline so it is a tight fit. ... Our 1964 Chevelle originally had 13/16-inch pilot holes for the steering linkage, while 1965-’67 featured 7/8-inch holes.

How to Add Power Steering to a 1967 Chevrolet Chevelle. ... Note an open-end wrench held on the flat of the pump shaft prevents movement while tightening. See All 21 Photos. 16.