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.
All V8 Chevy plug gaps in 1977 was factory .045
.045
maybe 35
.045
Need to know what engine you have.
.045"
.044 inch
A/C plug # R45TS and it gaps at 0.045 That is the factory plug.
What engine?
this is the proper
.060
valve cover gasket