Greeens sensible safe boost,,,.. IMO Yes, honestly I had a Cometic, on a freshly skimmed head recently rebuilt engine so As flat as possible block without decking, all lined up properly did about 5 or 6 k before blew into water gallery BUT HAD DEFO been blowing across the bores for some time

The reason I say the YBP item, is if you cant run to the cost of a gen WRC item...

Though having said that there are people who will suggest Cometic are MINT and have no probs... mine was fitted "dry" BTW