Porting and polishing will help it floe air better, faster, and smoother. It probably wouldn't help at all with starting. Taking it in and having the valves ground and milling it will sure make a difference (if that is your problem) In my brief experience there are a lot of tractors out there that need the valves adjusted or even ground. The head work shouldn't be too much. Maybe $300 if you don't need a bunch of new valves.
With a good compression tester you should be able to determine if your low compression is being caused by your rings or your valves.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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