Running a couple of 450's on tunnel ram and have no source for vacuum. Does anyone know if a base plate, say from a marine carb that has a vacuum connection, swap to a 9776, mechanical secondaries?? Trying to find something that will swap over, not real smart when it comes to holley carb's. Thanks for any and all suggestions.
Drill thru one of your baseplate studs and Make it a vaccum fitting, straight down so when installed creates a port...if studs are not long enough get one longer, slow and easy straight down the middle, has worked for me when vac portless. 60 Super 88
It would screw on but I'd question if it was exactly the same. If you have the marine carb throttle plate see if all the passages and the idle transfer slots are the same. If the slots are different I think it would affect the idle characteristics and the transition to the power circuit.
Easiest to drill the bottom of the intake where it doesn't show and tap for 1/8" pipe. Then use a vacuum tree off the back of a Q-jet or similar carb with multi-vacuum ports.
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