Intake manifold holes

Angelking

Well-known member
Have a Offy intake manifold and was wondering what these holes are for?

50044054161_c22d4a10e4.jpg


Thanks

AK
 

wallen7

Well-known member
Vacuum sources for power brakes, hvac control valves, emission vacuum supply and other manifold vacuum controlled items.
 

Angelking

Well-known member
wallen7":3rzmi7bj said:
Vacuum sources for power brakes, hvac control valves, emission vacuum supply and other manifold vacuum controlled items.

My secondaries are vacuum powered for the carb. Would that be a good place to source that from? I guess then the other one could then be plugged up?

AK
 

wallen7

Well-known member
The carb supplies its own vacuum for the secondaries, if you have no other vacuum needs plug both the holes.
 
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