How much Power can the D-Series block handle before it blows? I have a friend that turbo'd it to 225 and it blew up. If the internals are in good condition and it was tuned right how much can the stock internals handle before they are no longer reliable.

And also how much boost can they handle? Could you use a stackable headgasket to lower the compression to increase boost?

I know someone out there has tried this before, just want some input before i put my turbo on the car.