Hey guys. Haven't posted on here in about a year. It's hard to find the time for camaro work with busy family life. I check in every once in a while Here's the point - don't buy brodix heads. I bought the ik200 pre-assembled package in '08. I have about 10,000km on the engine now. Every guide wiped out, inner springs eating into valve seals, and they used a non hardened shim under the springs, which also wore out. Springs and valves survived. I did have decent valve tip contact pattern, just a zz4 hyd roller cam, nothing radical. If I had it to do all over again, I'd take my 1200 dollar heads and 1200 dollar repair cost and buy something good out of the box. I know I'm not the first person to have valve guide problems with these heads. Just thought I'd share. On the plus side I should stop burning oil now.