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Spark Plug/Carburetor question

651 Views 4 Replies 3 Participants Last post by  JHaleyH374
So I recently replaced the plugs in my car....I had Accel plugs in it (416s) that were gapped on .050 with a 70/78 jet combo in the carburetor and was slightly rich.......well I put a new set in last week and gapped to .035 per Accel's recommendation. Much to my surprise, I get to the track and have to add 4 jet numbers all the way around just to get the car within 2 tenths of what it normally runs in the heat.....evidently the narrower gap strengthened the spark ALOT and really leaned up the feels much snappier with the 74/82 combo but I am still 2 tenths off....AND the motor is still on the lean side. Think I should step up to 84's in the back next? BTW, this is a 750 carb.
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Is this the same carb?

Thats the same spec thats in the 750 on my car with 70/78 jets and a 5.5 power valve and it runs excellent....QFT has quite a bit of emulsion even granted my carb has a .093 slot restriction which makes a difference but I've never had one complaint...runs great, drives great, plugs are clean, and goes faster than any other combo I have tried in this carb. Everyone has their own theory on tuning!
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