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There's no need to pull the engine to replace the cam. Just take off the radiator and grill and take it out the front (after removing the head and lifters first!).
I recently had to replace the cam in my engine due to the cam nut coming loose and allowing the cam to slip backwards into the engine. The lifters were operating half off the lobes, and the #1 lifter had the big bearing sliding along it (that's what stopped the cam from going back any further) which wore it out rather quickly. If it slides back too far it can knock out a metal plug on the far end of the block behind the flywheel, which would necessitate removeal of the engine to replace. I did that once replacing a cam on my 1800E. I didn't have a puller, so I chocked the gear outward and tapped on the nose of the cam. Tap tap tap, and when it broke loose it slid back and I heard a metallic clatter inside the bellhousing. *GROAN* My project got a lot bigger in that half second.
You could loosen the adjusters on the rockers all the way to take the pressur off the cam and see if that loosens it up. It should move quite freely when the lifters aren't pressing on it with a great deal of force. Also, the mechanical fuel pump lever might hold it in place too - you'll have to take that off too (if you have one).
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I'm JohnMc, and I approved this message.
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