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the plug gap is .028 to .033 the point gap is.020
on the sump ajead of the filter
.020"
Point type distribitor plug gaps at 35 ths. HEI type distribitor plugs gap at 45 ths.
Most spark plug gaps are very similar from the point of view of sufficiency. The thickness of your thumb nail will suffice. Not tight though.
0.80
A/C plug # R45TS and it gaps at 0.045 That is the factory plug.
1mm
spark plug FR7DC2 set gap 0.9mm
A feeler gauge is actually a set of very fine strips of steel used to measure small gaps such as plug gap of an auto plug, or gaps in bearing surfaces.
.044
All V8 Chevy plug gaps in 1977 was factory .045