There are 2 zincs on the 2GM. If you email me your fax number I will photocopy the manual. j30381@(nospam)aol.com. The zinc on the back of the engine was very difficult. The zinc "holder" is held on by one large metric screw and that is part of a assembly that is held on by 4 screws. I ended up taking the assembly to a machinist to get the zinc out and grinding the hex fitting down to an SAE size. (because od all the burrs and corner rounding from my efforts to get it off)
