L67 vs N/A ecotec heads on n/a engine

[Gareth]

Hi all,

The idea is being tossed about at the moment about using L67 heads on a n/a ecotec. The primary idea is to use the injector location as an advantage in the L67 heads. (located in the port rather than the runner)

The bit Im unsure about is why did GM use port injection on L67 but not n/a?... I don't think cost is the issue here

Any thoughts?

Cheers, Gareth.

[delcowizzid]

cause the charger got in the way

[Gareth]

But why go to the expense of tooling up for two types of head?

[vlad01]

I might also add that the other major reason for this idea is to allow a unrestricted intake design. A new ground up intake design I have been working on and the injector incorporation has been a limiting factor, they are just in the way and are even more in the way when the injector boss is recessed out of the runner space.

So the idea of L67 heads makes total sense and are the default configuration of the aluminium heads anyway.

[vlad01]

But why go to the expense of tooling up for two types of head?

its only that they drill holes for most of the heads. Just FYI some period of the US made heads of the L36 has the injector bung cast in to the port just not finished off as they were for N/A engines. So that actually was the same casting used for both. Later ones they removed the pocket and I think that might of resulted in using 2 different castings again.