I have an 84 305 and everything says 45, and uses r45ts plugs
The spark plug gap for a 1984 Chevy 305 engine typically ranges from 0.035 to 0.045 inches. It's important to check your vehicle's specific service manual for the exact gap recommended for your application, as it can vary based on factors like ignition system and modifications. Proper gap setting ensures optimal engine performance and fuel efficiency.
0.045"
Per Champion spark plug applications chart, the gap for 1989 Chevy 305 (5.0L) is .035.
The Spark Plug gap is .045
.035
.035
.45
.045"
.045
The recommended spark plug gap on a 1996 Chevy C1500 with a V8-305 engine is .060"
.45
.035