Are all LS exhaust ports the same?

All LS1, LS6 and LS2 heads feature tallcathedral-style intake ports. The LS7, L92 and LS3 heads feature rectangular intake ports. The LS7 heads however, feature CNC-machined chambers, intake ports and exhaust ports. All LS cylinder heads, with the exception of the LS7 heads, are interchangeable among blocks.

What port are LS3 heads?

In its infinite wisdom, Chevy saw fit to design the LS3/L92 LS heads as a direct bolt-on for the early cathedral-port motors, at least those with sufficient bore size. The LS3 motors featured a 4.065 bore, but their cylinder heads would fit the 4.0-inch bore LS2 and iron LQ 6.0L truck motors.

What do stock LS3 heads flow?

As delivered from TEA, the LS3 heads offered peak intake flow numbers of 365 cfm, while the exhaust flow checked in at 241 cfm.

Are LS1 and LS3 headers the same?

The LS1, LS6, LS2, LS3 heads all have the same mounting points for headers on the heads/exhaust ports.

What are the intake valves on a LS3?

The LS3 heads hit the flow bench. The LS3’s 319-T5 aluminum alloy cylinder heads use 2.165 in (55.0 mm) intake valves, 1.59 in (40 mm) exhaust valves, and a 15 degree valve angle.

What kind of cylinder head does the LS3 use?

The LS3’s 319-T5 aluminum alloy cylinder heads use 2.165 in (55.0 mm) intake valves, 1.59 in (40 mm) exhaust valves, and a 15 degree valve angle.

How tall are the intake ports on a GM LS cylinder head?

All LS1, LS6 and LS2 heads feature tall cathedral -style intake ports. The LS7, L92 and LS3 heads feature rectangular intake ports. GM cathedral-style intake ports measure in the range of 3.125 inches high by 1 inch wide.

Can a L92 intake manifold work with an LS7 cylinder head?

Since any cylinder head intake port must be matched to the intake manifold port, only an LS7-style (in terms of port shape and dimensions) intake manifold will work with an LS7-style head. The L92-style ports are a bit narrower and a bit taller as compared to the LS7 ports. Again, intake manifold selection must match port style and dimensions.