I'm guessing you have a 112 LS and is a Comp Cam. I have this set up in an 02 SS A4, 4000 Vig, 4.10 Dana 60, and LOTS of other stuff. I have the ET Perf Stage 2 CNC, 2.05-1.570, 316-I, 241-E, Patriot springs, etc. I put this cam and heads on at same time on stock bottom end. Went from 8.20's-7.60's in 8th. Tomorrow I will put the 92MM Fast and Nick Williams on top of 382, Callies 4.0 crank, Compstar 6.125 rods, and Diamond coated pistons@11.1-1. I will put up dyno results from W2W next week for difference from that to more cubes with same cam and heads. My point is, I sent my 241's to ETP and got huge results for $1486.00 to the door and saved $1000.00 give or take. I sell and use the other heads you mentioned, and have no problem using them again. While doing my homework, I took the chance and was very happy and put the extra money elsewhere. Hope this helps. By the way, isn't GM realeasing the new LSX heads very soon? I was told 5 different versions by this spring. Check this before you decide!