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Old 12-11-2012, 08:34 PM
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If this engine was running before you pulled it from the car and put it on the stand, then I seriously doubt it is a clearance problem stopping the engine from rotating. The suggestions that something might be hitting on the stand, or possibly the fuel pump rod stuck, seem much more likely. Since the intake manifold is off, the possibility that something was dropped down an intake port. You said you backed off the rockers - are all the valve in a fully-up position? If not, something might be caught in a partially open valve, and the valve contacting the piston. If any of the valves are down lower than the rest, that may be your culprit. If you don't find something hitting the stand, or the fuel pump rod stuck, you will most likely have to pull the heads. If you find a stuck-open valve, that should at least narrow which head to pull. Good luck.
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