New head, new tune, now no boost

[tree98]

You are using very bad tunes plain and simple!!!! That will crack heads and cause boost problems all day long because those idiots don't know what the hell they are doing.Some of the statements you made are just loaded with red flags. There are only a hand full of people you can trust to tune an isx properly and they are found right here on this forum. Lately guys like you have found there way to this forum and then they want to argue with everyone about how the tune they are using can't be the problem, it's always something else. The best program ever written for the 871 is actually FREE for anyone who knows where to look for it. Are you hell bent on having 1,000 h.p. or do you just want a good reliable engine? Because you can't have both. Another reason your having these problems is because you probably didn't counterbore your block and shim your liners up to .014, doing this is non negotiable for a long lasting reliable isx. Also head bolts must be torqued properly.This forum is the best place in the world to get information about the isx, but you have to be willing to listen.