S/N W312 engine for tractor number WC301 is a nice fit.
The earliest W block I've seen is W39 it is also U3019-2
The block is very good
The sleeves removed it still looks good
No cracks on the lower webs
The early oil pump looks a little different from the later one too
I had the camshaft ground at Berry cam in Lester Prairie MN
The crankshaft was ground at Crankshaft Supply in Minneapolis
New sleeves and pistons installed
Cast iron oil pan back on and outside for some pictures
Right before the head goes on
Head torqued on and rocker arms on for test fit
Not sure if I will use this cast iron cover
It shouldn't have the breather on this early motor