Paint looks fantastic. What headers are those?

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New Foz Build http://ozfoz.com/forum/viewtopic.php?f=12&t=43042

They ultrex headers. They are getting ceramic coated and wrapped on monday so wont look as special.

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STi Ver 6 | 2.1L Stroker | 418whp | 11.5 @ 199kph |

Not fast enough dammit!

we send our heads to tony knight in SA, he has a CNC profile, so it doesn't make any diff on head you use, that is later than 99 heads.
then you throw the cams, bigger valves and valve spring to suit.
we also port match the intakes and exhaust
not a cheap exercise but good flow for making plenty of HP.
I AM squeezing some 630hp and 750nm of tugging, so the heads must be doing something right.
and still looking for more.....its a drug.....and its addictive....ask Justin..

Thanks for the info mate, but i would be having the head work done locally

I think ive tracked another set of v6 heads down. Ill be cleaning them up on monday to see if there is any cracks in this set.

The number stamps on the heads are exactly the same as the one i took off my v6. Is this enough to go on to say that they are v6 heads?

Also say if newer heads are used, does v6 intake manifold line up or would have to go GD styles?

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STi Version VI

No newer heads / intake same bolt patern only the early ones v4 and before iirc are different v6 and gd same same

using the Perth-WRX mobile app

Beauty, was hoping not have to swap manifolds.

Original heads



Sourced heads



Number stamps on:

Original heads RH C 009 & LH C 008

Sourced heads RH C 008 & LH C 008

Physically I can't really see any difference. Will clean them up Monday for further look

Can anyone shed some lights on the numbers?


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STi Version VI

Photo of the cam shafts ?

Correct me if I'm wrong but cant the cracks be welded up? Or is it the expense that is the killer?

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MY06 STi

Looks like the source set has a slight crack in it.

Here's photos of the cams on the sourced heads





I've done some homework and seems that the 272 non Avcs kelford cams are best to convert to shimless buckets along with the machining require to allow bucket/Spring travel. So the best bet is going 01-05sti shimless bucket heads and delete the Avcs. Set clearance and see if I require new buckets if it doesn't meet clearance.

Anyone got a 01-05 Sti heads that are for sale?


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STi Version VI

I think it can be done, and cost probably not an issue. It's more of chasing decent power and whacking a fair amount of boost but having thoughts of that crack/cracks getting bigger and destroying the bottom end if a seat drops.


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STi Version VI