Originally Posted by korey_hofer
Ls6 isn't 346, I think it's 366. the ls7 like in this truck is small block 427.
Wrong ls6 is a 346ci motor
LS1 5.7L (346-cu-in) engines were produced between the 1997 and 2004 model years in the United States (Corvette, Camaro, Firebird and GTO) and stretching into 2005 in other markets (primarily Australia). The LS6 was introduced in 2001 in the Corvette Z06 and was manufactured through 2005, where it also was found in the first generation of the Cadillac CTS-V. The LS1 and LS6 share a 5.7L displacement, but the LS6 production engine uses a unique block casting with enhanced strength, greater bay-to-bay breathing capability and other minor differences. The heads, intake manifolds and camshaft also are unique LS6 parts.
Read more: Gen III & Gen IV Vortec Truck Engines - GM High-Tech Performance Page 2