The 450 did not use the vent tube going from front to rear of head. It used a short tube in the rear hole and that was connected to the air cleaner inlet same as M's were. The governor still had vent tube to front of head but no fittings inside head. Poor man's pvc system that actually caused all the build up in the inlet tube of air cleaner and they kept using similar systems on the 6 cyl engines until they just said, put a plug in valve cover on those engines and pinch the tube going into air cleaner. I eliminated a lot of them over the years on the six cyl but just left factory type on the older four bangers.
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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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