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Ported and polished, increase of 30% flow to 255cfm. You can increase up to 270cfm but costs an extra $500.

Pressure testing the head. New seals. Angled valve job. Installing my new springs and then decking the head. So pretty much a full reco job.

$1050 plus freight of my head.

I might give them a buzz and see how much extra its gonna cost to install an oil restrictor to the head, figured i might aswell do it while its off. Going to do some more reading on it though.

his your head in the car yet.

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try envy imports. They recently bought a number of brand new RB26 heads and have been trying various different porting jobs and getting CNC programs done so they can now get them done on the CNC with hand finishing. I had a look at a few of the heads they'd done and they looked damn good. http://www.envyimports.com.au/contact_us.html 0408 637 489 Herman.

I wouldnt get envy imports to clean my toilet. i know a guy who got majorly ripped off (to the tune of 8 grand) by that bunch of puppets. Bad operators something shocking..

I wouldnt get envy imports to clean my toilet. i know a guy who got majorly ripped off (to the tune of 8 grand) by that bunch of puppets. Bad operators something shocking..

hmmmmmmmmmm

  • 2 weeks later...

havent got minr back either

the head was fitted and everything setup but was hell smokey while running

a pull down of the head reveals oil on top of piston no.6, other 5 are dry and fine

what can cause a failure in seals on the back area of the head? oil pressure has been restricted at the head with x2 tomie oil gallery restrictors, then again at the turbo becuase pressure was too high there.

the turbo oil restrictor is now set and works well for the correct flow (journal bearing turbo)

however head has the issue with piston no.6 oil on surface area, leak from head.

used 6mm new valve seals, new valve seats and guides but stock valves. head was ported etc, on a Cometic head gasket (1.2mm x 87mm) & arp head stud kit, along with 8.8mm lift kit and poncams

Please - any thoughts on what may have failed?

Ive said to the tuner that it must be a head installation problem, car was fine beforehand; want to send the head back to the rebuilder to be redone properly - or at least redone over piston no.6 area.

or is that asking too much?

damn.

God don't tell me that story!!! Mine is pretty much getting the same as yours, hope i don't have the same problem :santa:

How long did it take them to do your head? Was hoping to have mine back soon, but still no word.

Edited by PM-R33
  • 5 months later...

a guy in adelaide that does alot of headwork for high output drag bikes named trevor birrell done my head...pretty sure he has something to do with or works with that bullet place as between them both they make billet head for there bikes aswell

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