Posted by Brian on Sunday, April 12, 2009 at 01:29:27 :
In Reply to: You mean 'cast', not 'stamped'? posted by Chriscase on Saturday, April 11, 2009 at 20:50:31 :
Yes you are right the number is cast into the head and there is a capital "P" near the # 5 and 6 spark plugs.
I am sure the WN is for Washington state as the truck was owned by Boise Cascade in Ellensburg.
So the 6.10.54 stands for what again?