Hi everyone. I was able to find a set of SP 1000 cylinders with lightened pistons from a local person. Told me the pistons were lightened to within 2 to 3 ounces of 850 T pistons. I thought about using them for my 850T Got them for $ 75.00. So I took a chance on them. I figured the cylinders were worth it. I was concerned about the strength of the pistons. I took them to a local performance machine shop to ask them what they thought about the amount of material removed from the underside of pistons. The person I talked to is very knowledgeable in many types of engines. He is a very good machinist and has many years of experience. Has built mainly Ford engines such as 427 soch and other engines for racing. He told me the pistons would be good to go. As I get ready to assemble the engine I'm still a little hesitant on using them.
I wanted some more opinions on this. Here are some pictures of the underside of the pistons.