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Message: [QUOTE="SVTDanny, post: 1008569, member: 12467"] The 6.4 is nothing special. Uneven torque of the studs will cause issues. My chambers were down 3 to 4 thou below the rest of the surface of the heads. Think about that - there is enough torque in the cylinder to warp a 3.74" thick piece of cast iron that much, what do you think it's going to do to that same head that has uneven clamping forces on it? I took just enough material off to clean the heads up and my valve recessions were at .00215" and .00225" - Ford specs say the minimum is .0017". My heads, with even torque, are already 5 thou from being garbage. And if someone can't understand that whether the bolt bottoms out in the block or on the deck, it will still cause a crack at the weakest point in the hole - that's on them. An engineering, machining, and engine building background tells me all I need to know about why blocks are cracking. I see it every day. I don't need internet experts to tell me their theories. I guess I had mistaken this thread for being one open to actual technical discussion. Moving on. [/QUOTE]

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