You had better luck than me. My W9 had a loud knock when I bought it. #4 valve was running a 3/8" gap. Set it to spec and I suddenly had a dead cylinder, but no noise. Had to be 3/8" to run. Rockers, pushrods, tappets, rocker shaft all OK. Pulled the head and all the valves were perfect, near new in fact. Pulled it into the shop for some rear end work and pulled the camshaft. While I couldn't tell if it was bent, it was obviously damaged directly adjacent to #4 lobe. Looks like something got wedged in. Had a replacement cam on hand and swapped it out.
Should have had the spare cam ground to 650 gasser specs! But I did find out the engine has high-dome pistons.
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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