The Chevy Gen III LS1 small block uses an all aluminum block and
head design that shares the same basic external dimensions with
the original Chevy small block. This motor was designed from a clean
sheet for the 1997 Chevy Corvette and has since been used if and
can produce over 500 hp with just bolt on modifications!

This motor combined with the T56 six speed transmission provides a
platform for incredible light weight power and still maintain over 25
mpg.

Click here for more info on the LS1
LS1 /T56