IXK3 Engine

[wimpy]

Hi Again,
On this Hercules IXK3 engine the serial numbers are 687798. Would anyone have a close proximity as to the year that engine was produced and where I may find those references? Zimmermans believes the crawler may be between 1936 and 1945. Don't know if this is the original engine. Still can't find any numbers on the frame.
thank you,
Wimpy

[John Schwiebert]

What size pistons are in there now?
Are you sure you have an OC-3 not an HG? Send me a U2U I may have some alternate solutions.