no aluminum 4.8 so if you stumble upon an aluminum one in a truck it's a 5.3 and then i believe the newer ones you'll find an aluminum 6.2
the 4.8/5.3 blocks are stamped 4.8/5.3L except aluminum, which just says 5.3 on it.
really any of them are good. the 4.8 would like more gear than the 5.3. the 6.0 could care less as it's torquey.
DeadSkunk wrote: In reply to jfryjfry: Anything after 2003 has an LS engine. The 4.8 truck motors are aluminum heads, but iron blocks. Not every LS has an aluminum block.
Pickups got the LS in '99 (except the 'classic' which was the old style truck) utlities followed in 2000 when they switched to the new platform Vans were a bit later, 2003
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