The best stock-ish pistons I have ever found are the 526's (early rings) and 814's (later rings)... flat, no eyebrows, and about .075 below deck. I am not aware of anything different with the Magnum 'cept the deck is about .015" lower. There are indeed lower CH truck pistons out there.... not sure WHICH trucks they were in but the CH is another .083 inches lower...yikes.... over .150 in the hole! Beyond that, then you have the KB's, Icons, and so on.