lean machine

[terzmo]

340 motor with mild cam/msd ignition. Demon carb ran like crap so I bought a 750 proform...double pump. Running lean as plugs are gray to white. Original jets were 74/80(primary,secondary) Changed to 78 and 84...#1 and 2 plugs are gray...and 7 looks just about right as brown,bordering on black. (performer intake) Ran car at idle and sprayed intake with carb cleaner and besides being much cleaner, I saw/heard no leaks or increase/decrease in idle.

I can up the jets some more but would like all plugs to look like #7

air jets also need changing ? advice ?

Thanks to any in advance...

 

[RustyRatRod]

Explain your plug reading process please.

 

[terzmo]

not sure of the question but after doing the jet change...ran the car about 23 miles at highway speeds,some stop and go, and not jumping on it.( never went over 4000 rpm)....came home and pulled plugs and saw what was stated in the post