Where can I find STOCK compression (8.5:1)flat top pistons in a .040" over size. I need a set for a 121 head. These are for a race car engine and I cannot (because of the rules) go higher on the compression ratio. I am having trouble finding them. I can get a set of .020" overs real easy, but the .040's are eluding me.
Any help would be appreciated.