Numbers stamped on block face

Post by **wanderinstar** » Sun Apr 09, 2006 1:16 pm

Does anyone know what the numbers relate tooo that are stamped on block face. I have one engine that I am rebuilding and it has no. 1 adjacent to 1 + 2 bores and no. 2 adjacent to 3 + 4. The second engine has no 7 next to all bores.
Someone said they were grades. If this is true can you explain grades?
Ian.

Post by **bigginger** » Sun Apr 09, 2006 1:28 pm

It relates to the 'grade' of piston used, but I'm yet to find an explanation of how and why the pistons were graded