I am rebuilding another one of these for a friend of mine and got to thinking about something during disassembly and checking the butterfly shafts. When these things were run back in NASCAR in the 55/56 seasons, were the secondaries always vacuum? Did the engine builders ever modify these to be mechanically opened secondaries? Just wondering - thought it would be a trick way to put one back together if one of my buddies was going to use it for vintage racing.

Daniel Jessup

Lancaster, California

aka "The Hot Rod Reverend"
check out the 1955 Ford Fairlane build at www.hotrodreverend.com