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Older..... ....yer friend is correct, the frontmount camshaft is different from the sidemount camshaft. It has to do with the drive distributor drive schemes. Frontmount distributor is driven by an camshaft end "OFF-SET" slot scheme. Sidemount distributor is driven by drive gear on camshaft. As for "bosses" to mount gennys, thats a new one. The frontmount genny is on the engine rightside and held on by a bracket, not a "boss". The sidemount genny is on the engine leftside and is held on by a bracket, not a boss. The only things that I can think of that might confuse you is the flathead. The original 1939 flathead had a compression ratio of 6.0:1, and the latest replacement flatheads have compression ratio of 6.5:1. Which accounts for the change from 23hp to 26hp. Then there is the item of replaceable dry "sleeves". The original sleeves were 0.060 sheetmetal. The BETTER sleeves are 0.090 CASTIRON. You haffta rebore the block to accept the thicker castiron sleeve. They found out that castiron actually had better wear characteristics than hard sheetmetal sleeves. You look at the end of the sleeve from the crankshaft. Even fuzzy eyeballs can usually tell the difference between 1/16" and 1/8". You can NOT tell the difference in sleeves from the top of the block as they both have "lips". One last change, it the governor cup. The only governor cup is the proofmeter drive cup which works just fine when plugged. One last note: early 9N engines oilfilter return drained straight down to engine block. They changed the oil return to the governors cup with a longer tube around the front of the engine. This was because governor balls were getting flatspots from insufficent splash oil from engine drive gears. As I said, most engine changes are intuitively obvious..... ..respectfully, Dell, NOT an expert
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