The LS2, LS3/L92, and LS7 heads use production intakes, offer greater port volume and larger combustion chambers that are desirable with forced induction. The C5R head is not recommended, as it is an expensive part with a unique intake port design that requires a custom intake manifold, as well as a small combustion chamber that promotes a highcompression ratio that’s incompatible with forced induction. The 6.2-liter engines (LS3, L92, etc.) can use any head except the LS7 and C5R, while the 7.0-liter LS7 and C5R blocks can use any LS-series head. However, the larger 4.00-inch bore of the LS2 enables it to use LS1/LS6 heads, as well as L92-style heads (including LS3, LS9, and LSA engines). Using the heads of 6.2-liter and larger engines causes valve-to-block interference. In fact, even the later heads don’t all have matching port shapes-the LS7 head ports have a more square design, while the LS3/L92-style ports are taller and narrower.Īlso, because of the comparatively small bores of LS1 and LS6 engines (3.89 inches), when compared with the later 6.0-liter and larger engines, they can only use LS1, LS6, and LS2 heads.
Mostly, that means the difference between LS1/LS6/LS2-style cathedral-port heads and later-style rectangular-port heads. For these applications, the cylinder-head intake ports must be compatible with the intake ports of the supercharger manifold’s ports. The other crucial detail only applies to the installation of supercharger systems that mount the compressor in place of the intake manifold. The use of heads with six bolts per cylinder isn’t an absolute requirement on an engine making less than 1,000 hp or less than about 15 pounds of boost, but they should be strongly considered for racing applications generating high boost and high horsepower. There isn’t sufficient room in this chapter to describe all of the cylinderhead choices available to the LS engine builder-and more seem to arrive every month. Ensuring intake manifold compatibility with the heads’ intake ports is the only major caveat when selecting them for a supercharged or turbocharged combination.
The excellent port design and large-capacity runners allow for easy and efficient cylinder filling. There is an almost endless list of possibilities when it comes to boost-friendly cylinder heads for LS engines.
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