Originally Posted by AP-Risk
I've got an 06 Spec B with a cylinder 4 misfire. Worst case senario, from what I've read is a new engine. Worth is to go to the 257 and would it be difficult to do so?
Worth it is up to you. It's not difficult per se, in terms replacing a block it's probably easier than many. It isn't cheap, though. The shortblock alone will cost you $1800 or so.