Probably around 35. If you buy from a reputable store, they will come pre gapped almost dead on. Just measure one to confirm. If you run a slightly larger gap it helps in flame propogation. I usually go around 10 over, but keep under 60 at the outside. If you want to get trick, you can index them, but we don't need to go overboard here.
.035"
0.35
0.045
30 degrees dwell
25-.30
30 degrees dwell
A 1995 Chevy Van with a 454 engine will have a spark plug gap of .060 inches. A difference of .005 (give or take) should not affect the engine's starting capabilities, however.
The spark plug gap on 1977 Chevy truck 454 should be set at .045 inches. Spark plugs are preset at the factory and should need no adjustments prior to being installed.
0.035"
A person must leave the right size gap for the spark plugs when changing them. The 1999 Chevy Suburban has a spark plug gap of .060 inches.
i think .35 or it will be under hood on sticker emissions
The spark plug gap for a 1998 Chevy Lumina (with 3.1L or 3.8L engine) is .060".