Derding-
Mike is correct...the vacuum hookup rotates 360*. I just installed a new booster in my car and it easily rotates.
Is this a new or reconditioned booster? Who did you buy it from? Sounds crazy but I saw one guy put gasket sealer on the vacuum hookup gasket "for a better seal".
Couldn't turn that sucker for anything.
JB
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1966 GTO Coupe(#1845), AT, PS, PB, Nightwatch Blue
389 built by Gaydosh Performance - .040 over, 670 heads, 4bbl 750 Holley Double Pumper, Edelbrock Performer intake, Howards CAM and lifters, Scorpion roller rockers, TRW rods and pistons, Doug's headers, new TH350 with shift kit & 2000 stall, 8.2" rear with Auburn carrier & 3.55 posi Richmond gears
http://www.cardomain.com/ride/2240898/1966-pontiac-gto/