Okay, I learned the hard way today.When doing a head swap on an aluminum engine be sure to blow all the water out of the bolt holes. If you do not get ALL the water out of the holes you will have a hard time getting the bolts in the holes and run all the way down to the bottom. What happens is the bolt acts like a piston in a cylinder. If you keep cranking on it you can actually crack the block with the hydraulic pressure you will create. The bitch of what happened on mine is that it was the first bolt I started wrenching in at the front passenger exhaust side. That part of the block is thin around the bolt. I didn't even have to wrench hard to shatter a chunk of the block out. A couple holes down the way I notice a bolt didn't want to thread in so I notched an old bolt to clean the threads. When I threaded it in the bolt came back out wet. This might prove to be an expensive lesson learned. Oh well, LS2 6.0L short block might come sooner than expected.


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