Holley Sniper

[David C]

I should really have said that the Weiand is a divided single plane whereas the original is dual plane. Supposedly the longer tracts in the dual plane allow the mixture to slow further and give a more dense charge at lower RPM providing higher torque.
Looking at the original manifold, one half turns through a right angle almost immediately on entering the manifold so common sense suggests more puddling on one side than the other. Since the Sniper only uses an O2 sensor in one of the downpipes I struggle to see how it can get the mixture just right in both banks. Hence I decided on a symmetrical manifold.

If reading this gives the illusion that I know what I'm talking about, please don't be fooled. I very much welcome input from anyone who can see through my waffle and tell me where I'm going wrong.