[Mr Chevy]

1986 Chevy Suburban Heat Riser Question?

My 86 Burb has a vac operated heat riser on the pass side exhaust.

My question is without vac is it in the Closed? or Open? position.

Im not going to be using it and I wanted to make sure that if I simply put a vac cap over the vac port of the Heat Riser that it is in the OPEN position and not closed.

Thanks in advance for your response.