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.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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....Originally Posted by RedHeartbeat
they cast a larger bore into the piston liner area on the 6.0. The 6.0 block is a different block than a 4.8/5.3 block. The 6.0 block can be bored out +.030" larger to make it a 4.030" bore, too. The 4.8/5.3L block can be bored out to fit an LS1 piston up to 3.905" bore making it a 5.7L if you have that done.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I've actually heard that a 6.0L block can be taken as far as .080" over, but I've never seen it.
The 4.8/5.3 block bored to accept an LS1 piston and with a 4.00" stroker crank will make a 383...not too shabby for a block you can pick up for $100 or so.
2006 GTO M6 Brazen Orange
2006 Silverado CCSB Duramax
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