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heat riser operation question

745 Views 3 Replies 3 Participants Last post by  RB69SS396Conv
69 Chevelle, which way is the exhaust heat riser valve full open? with the vac on the canister, or with no vac on the canister. need to know which direction to tie it off in until I change the manifolds to headers.

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Vacuum applies the heat riser. (closes the butterfly valve)
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