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Not really Machinerys Handbook but you may find some interesting reading here :http://campkahler.com/files/How_to_Run_a_Lathe_SB_1of2.pdfhttp://campkahler.com/files/How_to_Run_a_Lathe_SB_2of2.pdf
Most reamers you buy in the UK will be H7 or H8 tolerance, with H8 being slightly looser and they will give a fit that is fine for a shaft run rotate in with minimal play. This will vary a tiny amount depending on meterial being cut, pilot drill size and condition of reamer. This is why I don't like to ream flywheels as the slight clearance can cause a wobble.If you want a press fit then if you have hand reamers you can take advantage of the long tapered lead in and not go all the way through, machine reamers won't do this. On little engines like this Loctite is your friend.I tend to use PGMS - Precision ground Mild Steel which is easier to work than silver steel particularly if you need to thread it. If I did use Silver steel I would not harden it.