At 09:45 PM 1/22/2002 -0500, you wrote: >Hello D^2 Definitely will lean out my dual quads as far as they, or >the engine, will allow it. Thanx for the warning about possible thinning down >of engine oil with a to rich of an air / fuel ratio To bad that there isnt a >way to messure the ratio at the tail pipe right now I am thinking of a probe >that our emission stations use here in Philly use .Sincerely Dieter 55 >Newport Here at the university, we have what we call a "wide range oxygen sensor" which is a probe that sticks in the exhaust. When it warms up (it takes a while) it gives you the air/fuel ratio. Neet device. We also have a "chassis dyno" which allows you to load the engine to normal driving conditions. Without that, you can only check the mixture at idle or high revs-no load consitions. I don't know where you can get these devices. What you can do is install a normal O2 sensor in the exhaust and get a reading (rich or lean, won't tell you how much though) and then play with the jets till you get it almost stoich. Good luck...D^2