Can I drill an RB26 head to take an RB25 exhaust manifold stud pattern?

[Chris Wilson]

If I wanted to fit an HKS cast iron, top mount, remote wastegate turbo exhaust manifold, made for an RB25DET engine, to an RB26DETT head casting, can I drill stud holes for the 2 ports where the studs are diametrically opposite on the 2 head types? Without going into water galleries et cetera? Thanks.

[Squizz]

Looking forward to the answer to this one.

If you were super-duper dodgy you could find someone who can cast-weld, like a large fabrication place, for the old "cut and flip"...

[bmxwrx]

You've got a beautiful rb26dett head, a total peice of engineering art and you wanna do that! you should be ashamed dude.

My advise, stop being a tightarse and buy a rb26dett manifold, the motor at least deserves that.

[Col-GTSX]

Do not drill the head. You have about 7 mm of alloy before you hit water. So the answer is no, dont drill. Sell you top mount manifold to me for 50 bucks and go buy a new one for the 26 motor.....

Seriouslly sell it on the forums for a couple of hundred bucks and then go buy one to suit.

[Bl4cK32]

RIPS on the forum here makes up an adaptor plate, which reverses the stud pattern so you can do what you are asking about. Pm or email him for more info pics....i'll try to find a link for ya

[Bl4cK32]

http://www.skylinesdownunder.com/forums/sh...&threadid=35120

see RIPS attached pic (post #4)

[SKY 34]

no I can't see

what sort of manifold is this..I'[m actually after 1..if you have pictures?

[discopotato03]

Another option is to weld extra bosses to the RB26 head , mill it flat and then drill and tap . Just be very sure the fabricator knows what they are doing . End up with hybrid tart head that will take any manifold .

Cheers A .

[nizmo_freek]

www.ripsltd.co.nz, send him an email, im sure he will be glad to help you out.

[Bl4cK32]

no I can't see

what sort of manifold is this..I'[m actually after 1..if you have pictures?

yerp email rips.

Its just an adaptor plate that goes in between the manifold and head with reversed studs.