Good morning! I pulled the 906 heads off the shelf that I had in the garage. These are the numbers I found stamped on: 28161 and 21412. These were both stamped on the heads by the machine shop supposedly. Does anyone have any idea what these #'s mean? And I have no way to measure the thickness of the heads. shruggy

Last edited by GTXKARL; 08/27/18 12:51 PM.
“Working on cars teaches you patience... and every curse word imaginable.”

1970 Plymouth GTX -- A true gentleman's coupe, but a serious muscle machine.