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The Spark Plug gap is .045
Per Champion spark plug applications chart, the gap for 1989 Chevy 305 (5.0L) is .035.
.045
.045"
.035
.035
.45
The recommended spark plug gap on a 1996 Chevy C1500 with a V8-305 engine is .060"
Sorry but I do not under stand your question.
.035
Drivers side, first spark plug in front is #1
0.035