This piston has h535 stamped on the side and 0.060 on the top. It came from a marine 488 wich is basically 1/2 ford 460. Its a merc block with a ford 460 head. It was rebuilt and someone put these pistons in after bored out 060. Mercury never intended it to be bored any more than 030. Thay don't sell anything bigger than 030 over.It stated in my book that the pistons were also used in 429/460. Im sure that the pistons he used were made to fit big block ford. It has an emblem that looks like a sheild with an S. need to find one piston and one single set of rings

 

Greetings.

I searched and found this:

https://www.ford-trucks.com/forums/2...r-is-this.html

Look at post 13. Bingo, Speed Pro Hypereutectics. That's where the good news ends, as I am having trouble finding a proper on-line catalog for Speed Pro. Will update if I find it.

 

Thread moved.

 

I think I found it:

http://www.northernautoparts.com/Pro...tModelId=10721