I just put a rebuilt 350 in my 85Z28. In place of my old 305. I have a stock 700R4 in it. Do I have to worry about putting in a new convert? If so what RPM range should I go with? Also whats the best brand going? Thanks.. From FatOne

 

depends how heavily built it is, if its just a mild build then the stocker will be fine

 

The proper stall speed depends completely on the power band of your engine. This means that if you have an engine that starts to "pull" at say, 2100 RPM and you have a 1600 stall converter, your performance off of the line will not be at it's best. On the other hand if you put in a 2400 or 3000 stall you will be wasting expensive power, since the converter won't be passing the maximum power to the tranny until later in the power band. In the example I used, a 2000 stall would be ideal since you will "flash" up a little bit on take off. You will then be at the optimum take off RPM. Sometimes too, people have the proper stall converter for the engine combo but have the wrong rear end gears to fully utilize the power.