question on phenolic spacers

pjc360 said
... answer if it robs power or provides more and where, i'm sure somone on this site knows.

I don't know how anyone could answer that without very careful double-blind dyno tests, and who would pay for that? I work in aerospace testing and we don't have funding to study things to the nth degree. I suspect a 1" spacer would have negligible effect on air flow and atomization of the fuel. The main thing is insuring you maintain the carburetor to intake match, such as having a 4 hole spacer if a dual plane intake.

There certainly are intake effects, such as the long runners in most current production engines (or even Mopar's early 60's Ramchargers) for better mid-range torque, or the long tall plenums in after-market intakes for high rpm. However, do you really think 1" is noticeable? Anyone who says they notice a big difference, treat as "hearsay".