Originally Posted by Rusty

Trying to figure out few things. When the head gasket(s) let go. What was the conditions for everyone who had this happened? High boost, high in the rev range, hard on the gas, high traction, boost spike, just cruising around, etc?

Think Spooler hit on something a few pages back with the billet block. Talked about the 350 block breaking during launch, and the cure was the billet block. So the block was distorting enough to break. The 370 block is stronger, but it will still distort. Not enough to break, but cause other problems. When you combine the things I listed above. You'll have the head gasket issue. The block is distorting enough to release the clamping pressure off the gasket. The distortion could be the cylinders walking, the outer part of the block, the galley area. If the area that is distorting is around a few head studs. A few will pull tighter, and others will loosen up. Also need to know which head gasket, left or right side. Which cylinder? The inside or outside of the gasket? If we get this info. Maybe we can map out which area is being distorted the most. The other thing is. Is the head being distorted? Is it doing it's own thing, separate from the block, or with the block?