<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: smoke' em II</div><div class="ubbcode-body">Also 66 is the code for the radiator assembly that will be listed on the assembly build sheet for the car. </div></div>
RK is the broadcast code. I think you mean that RK will be on the build/broadcast sheet.
http://www.camaros.org/coolingsystems.shtml#tag
RK = 3020004 69 Suburban 350 man - I assume it could be from a truck too.