I talked to them about the Gen III Hemi block they offer. It is their castings, not Mopar refurbished blocks. Billet main caps with studs installed. Didn't remember to ask who's studs. The problem is it is listed as a 6.1 but has a 3.917 bore witch is a std 5.7 bore. The only info the guy could give me was max 4.080 bore. No cylinder wall thickness numbers or sonic numbers. You would think for the price they are asking they would have more info than that.