Good one Eddie! That sort of beer you could drink thro J Lo's knickers and it would still taste good.
I suppose I could send a piccy of the manifold.
If you can get a friend (preferably with some Stella) to pick it up, its yours.
You must know some one in Oz who'll be in Melb. for the World Cup.
StewMck

Sound good. I'll see if I can arrange something.
Do you get Stella there then? Got to be my No1 beverage here... nothing else will do :o)

Ratdat

Just to add my 2 bob's worth. I "believe" that the GX exhaust manifold & the later cylinder heads have compatible port sizes. If not, i think it would not take much to adjust the manifold port size to match.
The later A14 & A15 heads addopted the GX inlet manifold bolt pattern & port shape, so i think that the 1200GX exhaust manifold will slip onto a late engine with any version of the GX twin carb inlet like it was born there.

When i got extractors for mine, i had to have them made, so i mounted the engine on a stand & took it to an exhaust specialist. He made me a lovely set of tri Y types at a price that i was able to afford & they performed well. He used [under sufference] the heaviest gauge pipe that his equipment would handle & they have lasted for almost 20 years.

These days i will get the new GX manifold that i bought back in about '85, porcelain coated. [black] Classy, servicable & relatively quiet. Now if i can only find the used one that i had laying about.

I defy anyone to measure the actual performance loss that their Datsun car suffers as a direct result of the extra weight of a cast iron GX exhaust manifold when compared to lighter extractors.
Chris

I don't know if Dodgeman is right.
The GX inlet manifolds that I've seen are all 2 top stud types that won't fit the A14/15 head (which has the 4 stud setup) without these two holes being drilled and tapped into the head. For information, they should be tapped exactly halfway, 2mm below the centreline.
Its no big deal, and if anyone in or around Melb. wants to put a GX inlet Manifold onto an A14/15 head, I've made a drilling guide that works grouse.
Punters are welcome to use it or I'll do it for beer.

89mm
If you are right, i will give myself an uppercut.
I have never actually bolted a 1200GX manifold to a late type head, so i could not speak from experience. Since no one had mentioned a problem with this in the last few years [i have a SERIOUS Datsun 1200 coupe racer up the road] i had "assumed" that they were the same.

If my assumption is wrong, then it's a case of mia culpa, & i would thank you for pointing it out rather than allowing dis-information to be disseminated further.

I will now go & put it to the test.
Chris

dodgeman,all the gx su manifolds i've seen (either 4 or 5) had the two studs outside the inlet ports,but i have a twin weber manifold with the centre stud only.i also just bought 2 nismo manifold gaskets with no provision for the outer studs.so it can go either way.me,i prefer the two outer studs,as the twin weber manifold showed serious problems with sealing against the head.the exhaust studs never changed,so at least they aren't too confusing.

B310GX
The Webber manifold that you have sounds like it is intended for the earlier A10 & A12, round port heads. I had believed that the stud pattern of the oval port GX head was adopted for the A14 & A15 oval port heads as well.
I haven't had a chance to check it out as i have been quite sick for a while & have just managed to feed myself for the first time in 4 days [hell, like i'm gonna fade away, yeah, right], but i will try & check with my Datsun racer friend tomorrow. He always seems to have a few heads & manifolds laying about.
Chris

between me and a dude in south africa, we checked out what we could

and the a-12 gx is the same as a-14 and a-15

the a-12 is diffrent (early and later models)

that said i dont know if there is a diffrence between oval and round port a-14 heads as im not sure which the other fella was looking at

grrr cant get image to come up in forum never have been able to, someone explain plz???

shows two manifold styles in regard to bolt hole positions

1200RC
As far as i know [knew?] the A10 & all "standard" A12's used round ports & the "2 top stud" stud pattern to directly secure the inlet manifold, while ALL A12 GX"s & all[?] A14 / A15"s used the stronger "4 top stud" pattern to secure the manifold.

These heads almost allways had the water passages for manifold heat & all of the ones i have seen had oval inlet ports. I have never seen, or heard of, a round port A14 / A15 head.
If you are right, i may well save myself some self inflicted pain.
It would seem to me that 89mm is modifying "2 top stud" pattern, round port heads for "4 top stud" pattern oval port manifolds. I guess that the head would need a little porting to reap the real benefit of such a switch.
Chris