I can't use the manifold from Carburetors.com because it is for HS4 SU carburetors; I'll be using HS2.

To smellsofbikes: the engine fits pretty well but there is not enough room for an engine mounted fan, you'll have to fabricate new engine mounts and adjust the length of the driveshaft.

I've seen 2-bolt carbs on 4-bolt manifolds using 2 of the bolts, the famous Lynx D1200 manifold was like that. Or is there some other difference that prevents it from working?

Honestly, I know nothing about the Datsun SU manifold but if my (British) HS2 SU carburetors will bolt up to it, somebody please let me know before I cut up my Datsun and my MG manifolds!

If you have round-port head, the (old) Lynx D1200 fits
If you have oval-port head, the factory Datsun A12T, A12GX or A14T manifolds will work. Only the latter is 4-bolt. All fit 1-1/2" S.U. type carburetors.

Carburetors.com makes a version of each.

Looks like HS2 is a 2-bolt vertical pattern?

Lynx D1000 is multi-pattern for Datsun A-engine, but I think no longer made new



Here's a home-made HS2 manifold for Datsun engine, made from stock downdraft manifold

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I actually have been using that same picture of the homemade manifold for reference! Yes, HS2 is a vertical pattern but my head is round port. Looks like I'll be building my own.

I have a round port one here thats not being used if interested...Im in Brisbane and am happy to post..

Whalebone-dave: it would be great if you could post a picture. I would be very interested if it's what I'm looking for.

Tell me if I'm wrong but it looks like this would fit...

Possibly, but the flange doesn't look quite right for Datsun A-series -- maybe it's for Datsun R16? But would probably be an easier mod than starting with a stock downdraft manifold.