[quote=carnut68 What am I missing? [/quote] the reason it is slowing ,down correct whistling
AKA, have you thought about the air density altitude change effects on your car? scope
If you have it tune lean for summer heat and humidity it will get a lot leaner in better air twocents
Does it miss or nose over anywhere during the run?
Another thing to consider is how many runs on the slicks, are they balling up and going away? work
How much 60 Ft ET are you losing? How about the 330 and 660 ET?

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)