I began a full tune-up including adjustment of valve lash. Installed new spark plugs, points (lubed cam), condenser, cap, rotor and ignition wires. I also installed a drivers window crank clip.
The intake valves were too tight, the exhaust valves were on spec or close. Three intake valves were at .003, one at .004 and one at .005. Three exhaust valves were on spec at .010 and the others were at .009. I suspect the rough running engine was a result of low rpm valve float on the three cylinders with .003" of intake valve lash. Due to the general lack of combustion in this engine, the spark plugs looked OK.
Every little thing I do to this car brings it that much closer to being a perfect car. I can't explain the joy it brings me to work on this 40 year-old machine. It truly is a treat.
First off, its great to use tools that I forgot I owned for several decades. But there is an honesty in the machinery. I give it something, and it gives me something back.
I'm starting to really remember why I loved my first Z.
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