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All the mods 3 best power9/7/2023 ![]() ![]() 799 cylinder-heads, identical to Corvette LS6 No. More importantly, it came with casting No. Found only in some 20052007 extended cab, four-wheel-drive, Chevy Silverado 1500 and GMC Sierra 1500 pickups, this engine uses 4.8L flat-top pistons in place of the LM7's dished pistons. Don't confuse this all-aluminum version with the rarer-yet all-aluminum Vortec 5300 HO, RPO 元3 (VIN "B"). Moving up the fuel chain, more highly-prized variants include the 20032005 290 hp/325 lb-ft RPO LM4 (VIN "P"), which had an aluminum block in addition to aluminum heads, shaving 8090 pounds off total engine weight. There are many other Gen III 5.3L variants, but being rarer, they're likely more expensive.
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