I'm actually running one of your Crabs also Jim and I have a McCulloch supercharger on my engine (I told you about it when I ordered the crab.)
It didn't run so hot when I put it on , so I backed the vacuum brake nut off a LOT and it runs way better.
I'm pulling the vacuum line off the front vacuum port on a stock 1936 aluminum intake. I tested it with thumb power revving the engine and there is vacuum all the time at that point, decreasing as the rpms rise, but never blowing my thumb off the port. always sucking.
Anything I'm doing wrong?
