Lou C
Supreme Mariner
- Joined
- Nov 10, 2002
- Messages
- 13,547
The other thing that can cause dark spark plugs is the carb running too rich (too much fuel vs the available air); and the causes of that are carb float too high, needle valve leaking and clogged air bleeds. A really thorough cleaning adjustment of the float level and and reassembly with new gaskets shouid make a big difference…might want to do that before converting to a 4bbl. While that will give the most improvement it’s fairly costly, a new Holley 4bbl is about $800, the Edelbrock is about $620, a used 4bbl intake manifold about $150-200, then there are small things needed for the accel linkage. By the time you’re done about a grand or a little more for the upgrade….
