i know on a 75 Chevy scottsdale with a 350 it is 35 thousandths
gap 45
.045 " is the correct gap.
The spark plug gap for a 1970 Blazer 350 is .035. Check new plugs for correct gap even if they come pre-gapped.
The a/c plug # is R44T or R44TS plug gap is .045
The 1986 Chevrolet 350 cubic inch engine spark plug gap is .027. Most spark plugs will be pre-gapped by the spark plug manufacturer.
Chevrolet covers all V8 sizes with a gap of 0.035 with plugs (Optional) R44T..Ralph Maldonado
you can use stock 350 plugs
0.019in
the gap is .60 on plugs gap is .060 on plugs.
.045.
On my 1992 350 van it's .35 gap
.060