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..... ..... Here's whatchya do if you can get it bored and stroked for free "maybe" get ya some 6.5" alumium pistons. stroke the crank to 8.5" Achieve this by shortening the diameter of the rod journal to 1/2" under stock, and the stroking it the rest of the way. You'll have to have rods made. (murphysmotorservice.com) and while you're dealing whith him get a set of his high ratio roller rockers. (around 700 for the rods and 350 for the rockers.) Have the cam redegreed to 720 specs. USE THE SWIRL HEAD....You can have it cut down to match the compression and fuel combonation you want to run. The flat head is boost compression, (too much actually) but isn't as efficient as the swirl head. All I did to the carb is take out the choke shaft and gound the throttle shaft down to optimize flow. All this stuff is gonna be a bit out of your 1000 budget, but assuming you can get it bored and stroked for free, it won't be drastically over. If your rules will allow it, use a K&N paper element filter and ditch the heavy stock filter. Results: I have dual exhaust on mine with the intake passage completely isolated from the two exhaust passges and this helps me out some.....but other than that this is my tractor. I have 30 degree firestones (uncut) and I pull the #5500 open class in 4th gear. and spin the engine up to around 1700RPM. I've never been beat in the uncut tire class, sometimes I run in the cut tire class, but I don't do as well, wins are usually down in the lower classes where I can use the speed I can make to my advantage. Next year I'm putting on cut tires and I'm leaving the engine alone. I'm gonna win me that season opener 10,500 Open trophy that's about 6 feet tall I've always wanted!!!!!
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