What does YD mean?
Thread Starter
2nd Gear Member
Joined: Jun 2003
Posts: 418
From: California
What does YD mean?
I'm rebuilding a 65 mustang 289. I was looking for the overbore stamp on the pistons, 5 of them are .030 over, two of them are 0. And one of the pistons looks like it has YD stamped on it. Does any know what that means?
