AEC 7.7 Piston/Piston Rings and Valve want d in Blogs of MV restorations Posted April 8, 2018 Hi all, I am in the process of rebuilding my AEC 7.7 Matador engine and No. 1 Piston has obtained some damage and so I require another piston, and rings. I was wondering if anyone has a Piston they do not require? Also, are new piston rings available for these engines as I would also require a full set? I also have a damaged valve, so again if anyone knows where I may find one that would be of great help! Regards, T.