Thread: plug fouling and other tuning problems

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You did mention "Pro-form carburetor body" added to your 3310. Did you add the secondary metering block to it and assuming you did was the secondary metering block configured for idle screws?

I have noticed alot lately that folks are using these proform add-ons without further attention to the idle circuits. Remember that the 2-corner idle 3310 carburetors also have 2-corner idle baseplates which need to be converted over to 4-corner idle use.

I have done tons of applications with 3310 carburetors, specifically bolted to BBCs. From the looks of it your combo is right on, but I think your tune is drastically off. Idle vacuum, when properly tuned should be around 15" with those BBCs. Check again for vacuum leaks (top-end leaning).

If the motor is fresh consider checking the valve lash again. Make sure you're not too tight.

Also make sure you have a good 12-volt source of power. I've seen dead batteries on the dyno become the direct source of headaches when sparkplugs starting fouling and reversion kicking up carbon back through the intake (hence the souty black on the carb and inside of the intake)

Hope that helps some.

~Ty @TLI/TPC