One problem I've encountered is multiple fold.
When running the stock crank pulley the blower runs a LOT of boost. IDK how much, but enough to make hella detonation. Smaller crank pulley solved two problems at once. Firstly, all the accessories run at a more "normal" RPM (chevy didn't design this engine to cruise at 3k). Secondly, it dropped the blower output to about 4 or 5 PSI. Just enough to make good engine noises, but low enough to not make problems for me.
The other issue is carb attachment to the blower. Originally I taped the blower for M8 X 1.25. I cut a hole in the top of it and tried to the best of my ability to make the mounting surface flat. It was not perfect; not by any stretch of the imagination.
So RTV. LOL
Hey it worked for like 5 years, so laugh it up.
Oh I was forced to "fix" this issue due to improper handling of the nitrous system. Did I mention I'm a dumbass???
I solved this by getting another blower and milling down the hole in the top. Yes, an actual mill... not an angle grinder.
I used a flat plate to bolt the carb down to the outside of the blower.
