I worked on a few Pontiac and Chevy engines in the past. Remove all of plugs and place a short wooden dowel straight down in one of the spark plug holes. Slowly spin the engine by hand where the valve should move the dowel up and down and measure the max and min heights of the dowel. The max height measurement is just beyond the max reach that the spark plug can be without hitting.
Keep in mind your max reach can be different then specs due to:
Milled heads
Thin gaskets
Custom domed valves
Loose valve train.
There is a spark plug adapter called anti fouling something or other that screws into the head and the plug screws into it. It will buy you some reach.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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