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GT6/Vitesse Mk1 Exhaust Manifolds


Christoph Wintersteiger
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Sadly the exhaust manifold on my GT6 Mk1 has a bad crack that's getting worse every day. I've been looking for a replacement for a while, but so far couldn't find the right one (they are all either badly rusted or cracked). At the moment, there are two on ebay, but they look different from the one on my car:

 



 

Both of them seem to have the right part number (306483), but ports 2/3 and 4/5 are not fused like on mine; see e.g., this completed listing: Manifold 3

 

Are the non-fused one simply earlier/later ones and they have kept the part number, or are they "pattern parts" by a different company? Will both of them fit onto my engine?

 

If you have one for sale, do let me know!

 

Thanks!

Christoph

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Christoph,

Rust on a manifold really doesn't matter - they are solid castings and will never fail through corrosion.

 

And Manifold 2  "needs new studs", I presume where it bolts to the down pipe.  They are a sod to replace, so I'd go for M.1.

 

The biggest difference between the six manifolds was when the head changed, from Mk.1, all-ports-in-a-line, to the staggered ports at Mk.2.  John Thomason's Originality book doesn't mention any other Mk.1 differences and shows a 'fused' primary manifold as Mk.1, while my Mk.1 Triumph WSM shows then as separate, so I don't think that is important.

 

John

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from a design life point i would expect the more solid version to crack due to heat expansion stresses more so than the more open version

 

but thats a drawn down from retired grey matter !!!  Pete

 

other variables could be the diameter of the downpipe ,and its sealing flange   when comparing Mk1 1600 throught to big saloon Mk1 2ltr

 

might all be the same but  I dont have any to measure

 

Pete 

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Thanks for all the replies! Makes a lot of sense that rust on manifolds shouldn't be a major problem as long as the studs are ok.

 

Intuitively I would also think that fused-branch manifolds are more prone to cracking, so I'll give the non-fused one a try this time.

 

Paul: since you mention stainless steel - are there SS manifolds of the "normal" shape instead of tubular sports manifolds? I'd be highly interested if such a thing exists!

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