Rear expansion plug of rear cam shaft question.

Max1196 said
There are two types of plugs used, it depends on the year of your engine block, the depth of the "step" where this cam plug goes , on the early block is .225 inch deep from the outer most edge (that would use the "concave plug") and the depth is .385 inch for the later block (that would use the "double step" style plug). Early block is about pre 74, later would be about 74 on. Pic below is 74 on.View attachment 1715320836

The one and left came out of the engine the 1 on the right is what the machine shop put in.

The Rusted one measures .220" 65 dart. The Barracuda had the same plug. The plug measures .100"
The one with new paint is 65 barracuda It measures .340"-.350" If you add the plug it would be about the same as the dart

Not the easiest to measure on the engins stand