Cylinder Heads

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Holden V8 Cylinder Head design

The following is a basic guide to cylinder head design dealing specifically with the Holden V8 engine. The Information below is listed as a quick guide so the user can denote approximatley which series of cylinder heads they have and what is interchangeable.

There are basically 4 types of cylinder heads available for the early Holden V8 engine 19??-1989.

RED MOTOR

Early models had no E.G.R ports or emission control fitted, a quick inspection of a pre-pollution manifold either 2 barrell or 4 barrell shows that there are no E.G.R ports underneath or on top cast into the inlet manifold. The heads fitted to the engine in question also should not have any E.G.R ports cast into the heads.

Mid to late model red motors have a U shaped port cast into both manifold and heads, a quick inspection of a "pollution" type manifold shows that there are extra ports cast into it, along with having a diaphragm type E.G.R fitted to the inlet manifold.

BLUE MOTOR*

Blue Heads have the same E.G.R type set up however, the emissions control port underneath the manifold is a hook type shape, also the later model heads are slightly ported for a bit better flow and an extra 2 bolts fitted to the inlet manifold. 3 types of inlet manifolds were available, a 2brl, std 4brl and the better flowing "BROCK" manifold.

BLACK MOTOR

Black heads also have the same type of E.G.R set up as the red and blue motors but the emissions control port underneath is square shape and 2 extra bolt holes fitted, also there were 2 types of inlet manifold available for the black motors, a standard 4 barrell inlet and the performance manifold known as a "BROCK" manifold.

  • later model blue heads came fitted with the square port design.

What is Interchangeable?

basically the manifolds and heads are not interchangeable unless some modification is made to them. ie. early red heads will bolt onto the black motor but there are 2 extra bolts on the black motor manifold and 2 square ports fitted, an old trick is to block these ports/bolt holes so they can be fitted with no problems but it is just easier to have the right head/right manifold for the task at hand.ie. square port manifold to square port heads, no port manifold to no port heads etc etc.