GM 5.7L Aluminum LS1/LS6 Blocks (Bare block) are direct
replacements for the 2001-04 LS1 and LS6 Corvette 5.7L engines.
Manufactured from 319-T5 aluminum, they use cast iron sleeves, the
production oiling system, and 6-bolt main bearing caps. The GM
Performance 5.7L LS1/LS6 aluminum engine blocks feature a 9.240 in. deck
height and accept LS1/LS6-style cylinder heads only. The blocks feature
a finished bore of 3.8980 in. and do not include a provision for Active