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77 Elcamino Exhaust manifold lever?

Tiny
ELCAMI
  • MEMBER
  • 1977 CHEVROLET EL CAMINO
  • 170,000 MILES
Hi,

I found some lever (switch?) Under the Exhaust manifold with broken metal wire.
I believe that this block the output gases for cold days. Could you tell me where it belong? Or which side I should turn it to be open? (I live in hot country)

thanks
I really appreciate your professionalism
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Tuesday, May 31st, 2011 AT 8:28 AM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That's an old "heat riser" valve. It's designed to redirect hot exhaust back through a passage in the intake manifold to heat the fuel during warm-up. There used to be a vacuum control connected to it to operate it.
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Tuesday, May 31st, 2011 AT 11:40 AM
Tiny
ELCAMI
  • MEMBER
  • 10 POSTS
Thx for your replay.

How can I know which side is open, following he red or blue arrow?
(blue is closer to engine block)
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Tuesday, May 31st, 2011 AT 12:24 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Since the vacuum control pulls up, I would expect up would be the closed position but I don't really remember. You have have to figure that out.
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Tuesday, May 31st, 2011 AT 12:30 PM

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