The ends of the heads, if they are rounded and no mount holes, it's pre 68 I believe.
If there are accessory mount threaded holes, it's later, probably a 307, 305, 350, maybe 400.
Look at the harmonic balancer behind the crank pulley. If it's about 3/4" wide, 6" diameter. it's an early engine, 283, 327.
If it's wider, 1 1/2" or so, it's a later engine, 307, 350. If it has an offset weight area, it's a 400.
Still the engine size won't tell what pump it has, any will fit, it's the distance from the mount flange to the pulley plate that matters. That is what aligns the belts.
I don't recall any early pumps having extra heater hose connection threaded holes. If it has a hose threaded boss on top, it's a later model, probably a 307, 305, 350.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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