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A comment or two that may help you. I overhauled a '62 Ford 4000 which is your 800 series, just painted blue and had to have several serious parts like crank and head. I heard about Hamilton's south of Sulphur Springs, TX. Went over there and this was a massive recycle shop with first class machinists and all...tried to locate them (for you)on Google search engine and found nothing....may be out of business...maybe no web site...????? My head was cracked in several places....FYI since one of your responses indicated dry carbon plugs as a possible indication.....my engine wouldn't run when bought so don't know symptoms. Regardless, I learned that Fords of that day did in fact have head cracking problems and they had devised a way to fix the crack..... since they had so many and needed to figure out how to make them servicable. They drilled a series of holes (approx #30 drill bit)butt-adjacent to one another all along the crack and slightly longer. They then drove lead pins in those holes until they were smashed. It was pricey, but about half as much as a new head....quite a while ago and don't remember $$$. Still have tractor and no problems; boy does custom mowing with it every summmer. Point here is that if you do need a head, there are alternatives to having to buy a new one. Mark ----- ----- ----- -- But soot to me is too rich a mixture or too cold a combustion chamber/weak spark not allowing all the fuel air mixture to go bang....leaving some half fired deposits. I know your pressure testing indicated cylinders 2 and 3 with exact pressures but they are in line with your improvement from #1 to #4 (which by the way is the opposite direction I would expect with coolant entering the front of the block and all the heat is in the rear). You need to look some more before you tear her down.Remove your radiator cap and see if there are bubbles in the water when engine is running. Remove drain plug and check "first out" fluid. See it it is water/coolant. Pull your plug wires (one at a time) on 2 and 3 and see if there is no change in performance. If you ar using a 10 heat range plug maybe you need to go to a 12 or 14. What is your thermostat opening value. If it is 160 or no thermostat maybe you need to get a 180....I did after people on here were talking about cold engines and couldn't believe the improvement in combustion performance on diesel and gas tractors....
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