You dont 'dyno tune' a carb'd motor like you would EFI. I mean,.. you can take it to a dyno,.. hook up a wide band to find out if its lean or not. Make a couple pulls and try different jet setting and advance settings. But these are all things you can do at the track.

Make a base line run. Let the car cool down. Pull a couple of plugs out and see how they are,.. sooty,.. brown ring around them,.. white and dusty or nice and clean? Plugs will tell how a motor is running better then any wideband or computer can.

Prime example is the car I have now. 306, AFR 185 heads, Vic 5.0 intake, 75mm tb,. 30lb injectors, Long tubes,.. a lumpy cam,.. The ehxaust smelled rich,.. if I got on it,.. black sooty smoke would come out. Yet when I took it to get couple base line pulls on the dyno,.. the wide band said it was lean. So lean in fact that it was cut off in mid pull.

So I'm not too happy about that. I'm contemplating what to do. I know the tuner is a good tuner and he will do a very gppd jpb. But I also know its going to set me back $400 while I watch someone else work on my car. And if I have any more problems later after I change anything,.. its right back to the tuner and another $400. I decided I was going to carb the car. As I'm doing the conversion,.. I decide to change the plugs while I'm at it to freshen things up. To my shock,.. the 1st plug I pull out is almost fuel fouled. I pulled out another plug. Same thing. All of them were almost fuel fouled. So riddle me this batman,.. How can the wide band say the motor is way too lean when the plugs say its running too rich?

I trust the plugs before I trust that wideband.

Buy a jet kit. Take some spare wrenches with you. Play around with it between passes. Check the plugs,.. and the motor will tell you how its running and the ET's will tell you which jet and distributor settings it likes best.

Hurst