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Help! I'm in the final stages of rebuilding a 72' 240Z. The Cam timing sprocket bolt has now come loose for the second time. The first time I pulled the head and had two valves replaced. (Also got a good bit of hazing about proper torque...) Replaced everything and torqued the cam bolt to 105 ft/lbs. Two short test drives, everything just fine. First longer drive, she stopped running about two miles out and when towed home, the cam bolt has loosened again. (Cam stopped spinning, pinged the top of several pistons, now need to remove the head and get valves inspected/replaced... again) Any thoughts on why this keeps happening? I don't want to continue fixing the same thing if something else is the root cause. (Definition of insanity...) 72' 240Z Original engine and E88 head Original intake and SU carbs (rebuilt by Z-Therapy) Aftermarket electric fuel pump (with flow gage to check and adjust the flow) Aftermarket exhaust 3/2 exhaust header 280X Non-Turbo Distributor Original AT (Rebuilt locally) Thanks, Chris
