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If the motor has good compression and oil pressure there is not a problem. There are many guys around here in the 11's and tens with turbos with the stock block without any problems.

Most of us will NEVER and I repeat NEVER will make enough HP to crack the stock block down the middle. Anyone that knows anything about boost will tell you it is usually a melted piston that ends up getting you NOT a cracked block. Avoid detonation and the stock block WILL take you a long way. Aftermarket stuff will break just like stock stuff if you detonate Its all in the tune.

It isnt about what you spend its about the end result.