Just some more info on the engine

Head is 2 5/8 x 2 1/4
Cylinder is 1 3/4"
Total height is 4 1/2"
Length is 4 1/4 back of housing to front of thrust washer.

G surrounding a 20 on the left side, ST sign on the right

It will take the 3000K series/MAG 4500 carb in the inlet hole with no bushing.

It has a backplate with a nipple in the center - looks factory.