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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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