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

 

I would go for the smaller diameters. 1.75 inch primaries are a bit on the big side for an 8 valve 1600.

 

so got ford the 1.5" manifold and the 2" exhuast system? If i use a 3 box system with straight through boxes will i still get the same performance as using a single box system?