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[Andy B]

......
No expert but i thought the crack had to be ground into a V for the weld 

Ideally yes, you get better penetration that way, but on something like the outside of a manifold it's perfectly acceptable to build the weld up & leave it. A weld prep is needed in places where you'd need to grind the weld back flush again eg on the mating face of the manifold where it bolts to the head. 

[Sir Tigger KC]

I'd give the High Heat Adhesive a go as it'll be quick, easy and cheap! 

As Mark has pointed out it only needs to be gas tight and it's been used and recommended by Symes!! 

[mrgreen]

I'm going to try that adhesive as mine has a crack and although i've got another manifold for it i am too scared of shearing off bolts to replace it!!

[Steve B]

So do the 2.2 manifolds seem to all crack in the same place 

[Marks DTM Calib]

If welding it then you need a U prep rather than a V.

For both welding and any other repair method, a small hole should be drilled first at both ends of the crack to stop the crack propagating in the future (a hole has no corners and hence no points where a stress riser can form)

[omega3000]

So do the 2.2 manifolds seem to all crack in the same place 

2.0 crack as well . Normally in the middle top or bottom .