i have used the XE268 cam in a warm 340. Comp say it is fine with a stock converter. I had 3.23:1 gears and 27 inch tires and found it was lazy at lo rpm. So a call to Sean at Dynamic and a new converter...problem solved. Fast forward to my current car and it is a stock 340 with a stock cam, fries the tires easily at lo rpm and pulls hard top well past highway speeds. lesson learned about cams in street driven cars. Now having said that from midrange up that 268
made unbelieveable power...where it was never used!