Need to know what year.
1,8,4,3,6,5,7,2.
small block Chevrolet with HEI ignition is 45
depends on the ignition system you're using. Hei
No.
72-75 AC R44T 76-80 AC R45TS
1,8,4,3,6,5,7,2 same as the firing order
1,8,4,3,6,5,7,2.
It should be the same as the small block.18436572.
that should have the HEI distributor so the plugs should be set at .045
.045
Take a known good spark plug and connect it to one of the spark plug wires. Ground the plug to the block and watch the gap for spark while someone tries to start the engine.
Chevrolet covers all V8 sizes with a gap of 0.035 with plugs (Optional) R44T..Ralph Maldonado