Tuning by the look of your plugs is not really the way to go. The AFR on the dyno is more important. If not when you are at the track tune to the best et. You shouldn't have a rear power valve for a drag car. When you leave the line the fuel pulls away from the valve causing a lean condition on leave. Just my 2 cents...Good Luck
Quote:
Originally Posted by SergeF
Air fuel ratio is fine. 4150 850 carb is barelly over 3 years old. 3 dyno sessions and 1 track day on it. Rest of the time it was sitting on a bench. Yes, it made a little more power compare to my old HP950 but that wasn't why I bought that carb. Sure, if I plug a rear power valve on hp950 it might be very close. Plug on the left is colder. It has about 12 pulls and 40 miles of street driving with a 1050 carb. Plug on the right is from my old motor with 850 carb. Needed a gas mask to drive around. I went back to hp950 carb on my old combo.
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