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Topic: Heat Riser

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Heat Riser (1/5)
9/11/08 11:32am

KDADDY79
Former Member
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

A few years ago I had the true dual exhaust installed on my '79.

With this setup I decided not to use the Heat Riser Valve anymore.

I remember the mechanic telling me he used some wire to leave it in the open position.

Recently I installed new Heater Hoses and shut off valves. During this job I must have knocked off the wire holding the Heat Riser open.

The Heat Riser seems to rotate about a quarter of a turn. Which way will open it? Clockwise or counter clockwise?

I wasn't aware of this until I heard a rattle in my exhaust. I realized it was coming from the Heat Riser which was flopping around.

Thanks in advance!

Kevin

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Heat Riser (2/5)
9/11/08 11:41am

VetteSpecialties
Former Member
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Mounds View, MN - USA

Vette(s):
70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe

Joined: 5/24/2007
Posts: 1031

I looked at a '79 valve in stock. Clockwise is closed, and counter clockwise is open.

Larry

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Heat Riser (3/5)
9/11/08 12:09pm

KDADDY79
Former Member
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Larry,

Thanks for getting to that so fast!

This really is a great site!

In 9 minutes I had an answer.

Kudos to you & C3VR!

Kevin

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Heat Riser (4/5)
9/11/08 12:47pm

Adams' Apple

Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20129

The spring on the valve will hold it closed when cold, so moving the valve against the spring pressure will open it...assuming the spring is not broken, that is.(and also assuming your's is not a vacuum controlled valve...) They do make spacers for that manifold that eliminate the valve...

Adams' Apple2008-09-11 09:48:47

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Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Heat Riser (5/5)
9/11/08 2:34pm

KDADDY79
Former Member
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Dutchess County, NY - USA

Vette(s):
White '79 Corvette. It's a driver.

Joined: 8/27/2007
Posts: 2484

Hey Joel,

It was a vacuum control valve setup. I removed the vacuum diaphram during the exhaust install. (Saved in my orig. parts box.)

I'll probably get the spacer for it when I re do the exhaust in stainless - someday.

Thanks for the help!

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