What a difference .040 makes.
Well, I did the retorque on the K301 head yesterday and got the sheet metal back on the tractor. Finally got to try out the milled head in some high grass. WOW. I did not think it would make such a noticeable difference. It does, Before the decarbon and head swap I would have had to cut this section in 1st and slip the clutch so as to not bog down the engine. I was able to cut it in second and never slow down. Only time the rpms fell was when I hit an ant pile and they did not fall much.
I recommend if you pull the head for cleaning or to replace a head gasket, take the head to the machine shop and have them mill .040 off it. It will wake up the engine. Mine is starting better, throttle response has improved and it has more usable power. I cannot wait till I get the K321 done as I am doing pretty much all of the "Killer Kohler" mods to it. It should be a beast. Many thanks to David Kirk for that write up.
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