1972 Demon 340 engine mods

These have an offset in the pin, hence the 4 eyebrows. IIRC, the late 340 pistons had 4 valve eyebrows but were about .080" below deck.

If those pistons above truly are at 0 deck, then they may be the Silvolite cast ones; they look right per all the pix I have ever found. The Silvolite number is 1267 and have a CH of 1.824" which would put them around .002" above a stock LA deck. (That Silvolite number crosses to Federal Mogul/Sealed Power 428P, per the Silvolite catalog, which have a .005" higher CH.)