the zz4 cam has an operating range that is too high for a tow rig. it is not making power low enough and requires me to run the revs out to 5500 when towing to be able to do things like merge into the eway. the zz4 cam is a 2-6k cam were the comp is a 0-5k.

it is a pos pro products. its a copy of a victor jr iirc.