The short version:
Weight of engine------------------------------------------------------12.75 oz.
Weight of muffler-------------------------------------------------------2.75 oz.
Width of case below mounting lugs--------------------------------------1.558
Width of lugs-----------------------------------------------------------2.278
Width between mounting holes, center to center-------------------------1.945
Distance between mounting holes, front to back, center to center---------0.995
over all length from back of engine to face of prop drive washer-----------3.60
Length of prop shaft----------------------------------------------------0.895
Shaft size-------------------------------------------------------------5/16 x 24
Height of engine, to top of fins------------------------------------------3.842
Baffle aluminum piston, no ring
Rod bushed at crankpin with oil slot, don't know about wrist pin end
Head button with deep hemi configuration
Jim