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Can't rotate crank on engine stand
On the engine strand, with all of the rockers off I can't rotate the crank. It stops just before #4 TDC.
I took the engine (1979 911SC) out to get the transmission re-built.
I then checked my valves while the engine was sitting on a motorcycle stand, no problem it rotated. Then I got a set of used SSI's while installing it one of the #3 exhaust studs broke while torquing it. I then decided to clean the engine up and have my cams re ground to 964 specs.
I purchased an engine yoke put it on the engine, I put on the rear engine mount and attached a chain to the ends, and then using a 2x4 to spread out the chain, I attached the other end around the engine yoke and lifted it up and put it on the engine stand. I have removed all of the rockers and the end cam covers and tried to rotate it to #1 TDC before I took out the cams, and it will not rotate.
Other than than I haven't done anything stupid that I know of? HELP!
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