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My book says 3.875.

Yep, replace the broken parts and run it. Let me know what all you need. Double check the valve adjustment screws. The manual gives a torque spec that it should take to turn it. Any less and replace. I still think thats what caused the damage.

I just did a quick ebay search for M151 camshaft and found two, one used in North Carolina for $65.00 and an NOS one in Ga for $100. The guy in North Carolina states he is selling all his 151 parts including surplus engines.

Elkhtr, I don't think it would be a problem at all. I only replaced the broken lifter in Andy's engine instead of changing them all even though I changed the camshaft with a used shaft. If there is any problems I think they will wear in to each other. You may have to adjust the valves again...

elkhtr, I just repaired an engine in an A2 for SS member grits with the same problem, only it was one valve. Check the valve adjustment screw in the affected rocker arms. They are supposed to be hard to turn and have no lock nuts. In Andy's engine that screw was real loose and backed out...

whiterabbit is right, it is well documented that the choke has to be out for them to run right. Military mechanics used to set them as described above because some of the young drivers did not understand this and it was easier to set the choke so the driver could push it all the way in and...