336 pistons/rings

There were some aftermarket with a dome or lump or slight cavity on top but for the most part, heads controlled the compression on MM. Most pistons were flat.
 
Charlie Biler has your pistons new and at a great price.He is a very knowlegdable and helpful gentleman.I dont have his number handy but he posts some times and maybe somebody can put it up here.If you want to still run your tractor in the field and pull try .125 over pistons with 4230 heads You will be over 90hp with great field manners
 
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