20 to 25.000 points 16 to 18.000s
35
For a 1970 OMC 6HP engine, the recommended spark plug is the Champion J6C or an equivalent plug
0.35
Points .017 and spark plug .035
.035 inch
.035 is recommended
.035
The spark plug gap for a 1970 Blazer 350 is .035. Check new plugs for correct gap even if they come pre-gapped.
0.035
.035
ACDelco R45S conventional spark plugs for an original ignition system.
It would be best to discuss this with Pertronix.