The cast iron one piece
exhaust manifolds for the Factory MGBGTV8 need care when fitting a new exhaust
system because the bolt hole flanges can very easily fracture if undue stress
is put on them. So it is essential that the pipes of the exhaust system are cramped
in or pushed out so they match the cast iron manifolds exactly - it is essential
any mismatch is not cured by pulling them up as you bolt the pipes to the manifolds
or a cracked flange is very possible. Where a flange does crack all is not necessarilly
lost as they can be welded.
Item 24 - BHH1001 Gasket, exhaust
Item 25 - BHH1000 Manifold, LH
Item 25 - BHH999 Manifold, RH
29 - SH50691 Bolt, manifold
From the Moss MGBGTV8 Parts Supplement, page 10.
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See a full size photo of the manifolds above. More