Quote Originally Posted by RedHeartbeat View Post
The engine block bore is the same for the 4.8/5.3 only the crank and rods are different, shorter stroke. The 6.0L has two configurations, low compression LQ4 and high compression full floating pistons in the LQ9. The 4.8/5.3 engine doesnt have enough wall thickness to handle being bored out to 6.0 without being sleeved. By that time its cheaper to buy an LSx block. I haven't heard of anyone putting a 4.8 crank into a 6.0 block to make a high reving engine.
How does the 6.0L compensate for the thickness without going to a new block. I don't know too much about engines but it seems the only way to have thicker walls is to space the pistons farther apart. Which would mean a slightly longer block and probably a different crank and camshaft as well....