I have been looking for a 54 thru 63 six to go in my 51 but so far no luck. I might be forced to rebuild my 216. My motor runs fine but knocks horribly. I adjusted the mains and rods but still knocks. I think it must be a piston slap or wrist pin. I used a broomstick to listen with and hear just a whirr at the crank level and LOUD knock at the cylinder level. If anyone has a motor please contact me.
