Zd30 intake manifold question

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Klompa

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Hi guys I've just taken the head off my nav and noticed exhaust ports on the intake side. By following the path of the exhaust ports back through manifold it goes into the intake side of the manifold.

So my question, Is it pointless to do the egr block (witch I've done) because you will be getting exhaust gas in the intake anyway?

Cheers klompa

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they are not exhaust ports.
they are intake ports coated with soot from the egr. they also use two different shape runners for the intake as only half the runners have egr in them.
edit: square ports are egr + air while round ports are air only.

the valve arrangement is a little odd. the intake valves are on the front side of the cylinder. ie one intake runner goes all the way over to the exhaust side of the head.
 
Last edited:
Yeah ok i think the valve setup and the port shape through me cheers mate

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