Scott is correct on both counts. I used the one in the back for my vacuum brake booster. I think it is a 1/2" fitting. I used a 1/2" TO 3/8" brass adapter fitting to convert the manifold fitting to my brake booster.
The steam line can go to either the radiator or plumb it into your water pump or heater hose lines. Will work either way.
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Chris
1968 Camaro SS
LS3/T56
Full of DSE and Holley parts
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