165 exhaust manifold

[Austin2]

I am rebuilding twin 165 L6 6Cyl approx vintage 1980 but they have differnt exhaust manifolds. One is a Barr the other OSCO and one is for a 250hp while other is for 250 to 290hp. The risers are OK but the manifolds need to be repalced so the question is "should both manifolds be the same"?

 

[chiefalen]

250 hp for a l6 ?

290 hp for a l6 ?

Or do you mean ci cubic inch's ?

If they are l6's they both take the same mani.