"100% To20 except for the replaced block and, therefore, does not have the timing marks on the pully and timing cover"
My To20 has the timing COVER marks. Looks like two cast-in triangles. It also has the hole in block under starter and the flywheel marks. I have never checked to see if the pulley is notched or not. I've always timed this TO20 with a lite or static thru the hole.
My TE20 has the timing COVER marks (like two cast-in triangles) but has a front pulley with NO notch. Also odd about the front pulley is that it has 4 holes for a puller tool. A very large flat headed screw instead of a bolt holding it onto the crank shaft. THe large screw is slotted for a standard blade type screw driver. NO ratchet for a hand crank,. The hole thru the front axle pivot does not line up with the center of the engine crank shaft. I've not tried setting th e timing on the TE20 yet.
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