[KiWinUS]

I have assembled them in about every order possible. My opinion is it really doesn’t matter on the order so long as everything works out and you don’t have to back track. I will sometimes install cam and valve assemblies to include setting valve lash clearance and then crank ,piston and rod assemblies. My opinion is the order doesn’t matter, just needs to be done correctly.
Over 55 years of building all types of engines from stock to world class race engines. If you install cam first just lube bearings and rear gear then once installed brush cam lube on lobes from the bottom no crankshaft in the way. Less messy and too easy.