I've read a lot about these heads, but My thoughts are inconclusive. I know after '75 Chevy cut costs, emissions, etc. and the 882's from then after were prone to crack, and supposedly offered less performance. On the other hand, my engine builder has a set that are still good i.e. not cracked and are in his words-"simply needing a valve job and new springs". I'm building a '76 400sbc, bored .040", and looking for 300hp at minimum. Am I dreaming with these heads or is my very reputable engine man being truthful with me? You guys rock and know your stuff, I humbly ask your opinions and am very thankful for them..... Please help me make an educated decision... Thanks again!