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Screwed into the heads.
It is located where all the spark plug wires attached to the spark plugs go to it.
Bust your knuckles with the use of a mirror to see the plugs and a magnet to pick them up when they drop under the engine block!
88
.88
0.035 inches for CR43TS or R43TS AC Delco spark plugs
.060 thounsands
AC DELCO rapidfires heard nothing but good things about them and that what im about to put in my 89 350 TPI
Start with the ign. wires and the spark plugs.
Check firing order Two of the plug wires are crossed.
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Should be a 5/8 spark plug socket.