GM Point Distributor Advance Gauge

thingiverse

Two parts, the degree plate attaches to the point plate of GM point style distributors, the pointer slides down on to the point cam. Tool is used to measure the degrees of distributor advance, and mechanical advance on GM point style ignitions. I'm going to assume if you are downloading these parts you know how to use them. On the bench you must install the plate and pointer, align to zero, clamp distributor gear and distributor body in such a way neither will move. Activate vacuum can and read degrees of distributor advance off the dial, spread the advance weights to measure the maximum mechanical advance. Can also be used with the distributor installed in the engine since the cam will prevent distributor shaft from turning, and distributor hold down will prevent distributor body from moving.