I have finished building my 1600 cvh. But i dont no what size exhaust manifold and exhaust to use. The engine has had quite alot of work done. The head has been ported & polished and has a cvh33 cam, double valve springs, solid lifters and twin 40 dcnf carbs. I was thinking 2 inch exhaust but not sure about the manifold.
1.75" PRIMARY, 2" SECONDARY, 2.25" EXIT
OR
1.5" PRIMARY, 1.625" SECONDARY, 2" EXIT

Which 1?
thanks rob