All the old hot rod tricks; port matching and polishing, manifold polishing, timing advance(with better fuel to combat pre-ignition), dyno tune the carb, loose the muffler, anything to help the engine breath easier, little model airplane fuel(nitro methane) in the fuel, smaller tires on the front, proper hitch height,right air pressure in the rear tires to match the track, etc..
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Today's Featured Article - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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