cbwood Posted March 29, 2010 I have an '06 450 bought used so..... on the right side, on the outside, on the intake runner on the head are some numbers hand etched into the casting they say "4X6" and "89". Any idea what they are? Share this post Link to post Share on other sites
grayracer513 My Ride Posted March 29, 2010 Match numbers used at the factory. They mean nothing to you. Share this post Link to post Share on other sites
