Do all 5.3 engines have catherdral port heads?

[Pete68]

Researching for my LS swap. Im wondering, do all 5.3 truck engines have cathedral port heads? I know the Gen IV engines got rectangular port heads around 2007 on the 6.2 engines but did the 5.3 engines and 4.8 engines ever get rectangular port heads too? Thanks

[csouth]

In my years I have never seen a rectangle port on anything smaller than a 6.0 and those were the LY6 truck motors and the L76 motors from the Pontiac G8

[btmatt]

Chevrolet LS rectangle port heads need at least 4.00 bore. 5.3 and 4.8 are 3.78". LS7 heads require even larger.

There are several aftermarket manufacturers that offer other solutions

[badazz81z28]

All 4.8s, 5.3s, and 5.7s came with cathedral port heads. Like mentioned, the square port heads were not put on any engine with a bore smaller than 4”

[Pete68]

Thanks everyone