I dont know if you are talking about my car or chickenwafers, but if you are talking about my car mine is a 78 280z and has fuel injection.

Bypassing the heater won't hurt anything on the car. It decreases the total volume of your cooling system a little but not enough to hurt. You won't enjoy driving in cold weather as much, however!

Cool, I was leaking coolant down by the radio and did'nt want the stereo to blow, payed too much for the dang thing.