Sorry guys i think i got a little confused as to what magazine i was talking about so after work i looked through stacks and stacks of magazines till i found the may 07' car craft issue for low buck 6.0l power. pg. 46 shows the power curves and the l92 heads lost power from 2200 rpm all the way till 4800 rpm. BUT, they changed to a bigger cam so instead of condeming the l92 heads i would rather blame the cam they used. i wish i could get an apples to apples comparison where they only change one thing at a time and do a dyno pull after each one instead of two or three things. Sorry for the confusion. l92 heads are bad ass again and everyone with a 4.0" bore or bigger should have a set. However there is still an ongoing debate as to which head gasket to use. the 6.2l head gasket or the 6.0l head gasket for the simple reason that the 6.0 gasket will hang into the combustion chamber of the l92 head. the l92 heads also need off set intake rockers and a totaly different intake. A head swap to l92s can probably be done for under 1500 bucks. way cheaper than any aftermarket head. Sorry to confuse anyone.