I'm gathering up parts to freshen up the '53 Merc flathead I bought a while back and was going to order some piston rings - seems lotsa folks have the 5/64 - 5/64 - 3/16 sets, but measuring the ones on the pistons gave me 3/32 - 3/32- 5/32 , which made me wonder what pistons these were. The motor is a 3 5/16" X 4 1/8". I got looking at the pistons and inside the skirt where they're machined, it says Edelbrock. Does anybody know when Edelbrock made pistons? Where can I get rings for these?- BTW they have full floating pins.