    
Joe Reeves
Senior Member
Username: joereeves
Post Number: 7612
Registered: 02-2001
| | Posted on Monday, July 06, 2009 - 02:58 pm: | 
|
Champion QL77JC4 plugs. The original gap, back as far as 1973 or so was .040 . That recommended gap was changed to .030 at some point around 1991, somewhere in that area, supposedly to make the plugs last longer.
Some engines run better on one gap or the other. Try both settings and compare engine performance. If no difference, use the .030 . |
