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12 port head to 9 port manifold adaptors.

Started by _gtrtorana_ , May 04 2009 03:31 PM

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8 replies to this topic

#1 _gtrtorana_

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Posted 04 May 2009 - 03:31 PM

Been looking into the alloy head option for my 202 but these heads only come in 12 port versions. Just wondering if anyone out there knows if you can get adaptors to enable you to bolt up a 9 port intake manifolds onto a 12 port heads.

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#2 _Squarepants_

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Posted 04 May 2009 - 04:28 PM

2 steps forward, 1 step back I reckon.
You could cut and shut the manifold.

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#3 _gtrtorana_

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Posted 04 May 2009 - 07:14 PM

2 steps forward, 1 step back I reckon

I would be one step ahead still if that was the case. I have triple CD strombergs with original Holden manifold and love the original look, that is why I do not want to change my intake set up.

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#4 _oldjohnno_

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Posted 05 May 2009 - 07:02 AM

Probably better just to fabricate a new intake rather than butcher the original.. Performance wise it won't be much different to a good 9 port, the main advantage will be the few kilos weight saved. Don't forget the extractors will have to be changed or modified as well.

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#5 warrenm

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Posted 05 May 2009 - 08:30 AM

To fit a 9 port manifold to 12 port head you have to add some metal to the flanges to allow the studs to locate the manifold & maybe a little to the bottom.As for the extractors you may have to add a little to the flanges as well.
Warren

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#6 FastEHHolden

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Posted 05 May 2009 - 06:35 PM

the front and rear pipes need bending going from red to blue...they don't sit right and are under tension.

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#7 wot179

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Posted 05 May 2009 - 07:11 PM

gtr_manifold__2_.JPG 806.82K 18 downloads

gtr_manifold__3_.JPG 820.61K 13 downloads[att
achment=2270:gtr_manifold__4_.JPG]

gtr_manifold__5_.JPG 844.74K 12 downloads[attachme
nt=2272:gtr_manifold__6_.JPG]

gtr_manifold__7_.JPG 774.87K 9 downloads[attachment=22
74:gtr_manifold__8_.JPG]

gtr_manifold__9_.JPG 826.1K 9 downloads

gtr_manifold__10_.JPG 863.27K 13 downloadsr_manifold__10_.JPG]I bought this off ebay a couple of weeks ago.As you can see,it has been butchered considerably.
Looks to be an attempt at a 12 port conversion.

I suspect you will have to do something similar if you wish to retain a factory manifold.Just do it better.