You should look into sleeving the engine as well. The aluminum bore isn't terrible but rebuilds will be more frequent especially when revving as high as you want. I've also heard good things about the 94-ss cam and it isn't real expensive. As for which engine you should build, take a look at the...
I am not an expert on cams but I know flow is more important on flatheads than compression, so shave the "eyebrows" (the area between the valves and bore) which will yield a greater power increase to more than offset the decrease from compression lost. You can port the intake but you want to...
Had an 18hp on my kart with a 4 disc clutch but it was too much weight on one side and it bent the axle. The kart was a freight train and weighed ~430lbs without ballast. good luck with the sale, these are truly great engines!:thumbsup:
WOW! I don't know what you've got there, I've ran Bullys and Horstmans but i've never seen a clutch quite like that. The Lever set up is very odd and so is the driver. Can't wait to see what it is if someone knows.:thumbsup:
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