Reply to "I'm stumped ... I'm fouling the #2 spark plug"

panteradougMember

Richened it up to 68's? Wow, they are on the lean side.
On my Holley 4779, 750DP I run 71 primary, 75 secondary, 7.0 power valve.

The hot ticket would be to run an 8.5 and 67 or 68 mains.

One thing that you need to look at is the idle restriction.

If it is smaller ther .028" then the idle is going to have flat spots or stumble off of idle. LEAN stumble.

The DP's idle rich because this retriction has been enlarged to cover the scavenging leaning effect from a good set of race headers.

I think at this point an exhaust analizer might be in order. It won't hurt. Itis hard to tune in the dark.

6/15/074:47 PM

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