there were cast-in provisions for
GM's Active Fuel Management
cylinder deactivation system.
Chevrolet Performance also
introduced a cast-iron version of
the LS cylinder blocks designed
expressly for high-performance
engine builds, including forced
induction such as superchargers.
This allowed the use of all
production parts and accessories.
LS CYLINDER HEAD
SWAPS
Cylinder head interchangeability
enables great parts mixing
to build custom LS engine
combinations, but the heads
must be matched with intake
manifolds that have compatible
intake port configurations. The
port sizes and shapes include:
• Cathedral port – Introduced on
the LS1 engine and used also on
the LS6 and LS2, cathedral-port
heads are named for the unique
shape of the top of the intake port.
• Rectangular port – LS7-style
– The second LS intake runner
design debuted on the Corvette
Z06's LS7 engine. This rectangular
design supports the straight-
through airflow design of the
heads.
• Rectangular port – L92/L94
style – Similar to the LS7 design,
but the ports are a little taller
and a little narrower. They flow
more than cathedral-port heads,
but not as much as LS7 heads.
Because of their comparatively
small bores measuring 3.89 inches,
LS1 and LS6 engines can only use
LS1, LS6 and LS2 heads. Using
heads designed for larger engines
