Have a set of stock 853 99-00 centerbolt LS1 castings. Motor had too big of a cam in it and it bent all the valves. Seats look to be in good shape though. Anybody with a 6.0 looking for alittle performance boost can have these ported locally and have springs and valves installed for probiably well under 1K total. Looking for $150 + shipping for the heads.