Jamming Heat Riser Down/Open
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 98
From: Ontario
Jamming Heat Riser Down/Open
My heat riser works free and easy but never settles in the down/open position when hot. I don't have a welding machine. How can I jam/hold it down? Some form of metal shim against the exhaust manifold?
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
Paul
you can use some type of metal wire, such as the previously mentioned coathanger, to wire it open all the time. You store your cars in the winter anyway so don't really need it.
Wire it against anything handy you can to wire it open, perhaps wrap the other end around one of the A.I.R tubes or anything else.
You might find it easier to just remove it ad replace it with a spacer unit or remove it, pull out the valve itself so it's always open, and reinstall it.
you can use some type of metal wire, such as the previously mentioned coathanger, to wire it open all the time. You store your cars in the winter anyway so don't really need it.
Wire it against anything handy you can to wire it open, perhaps wrap the other end around one of the A.I.R tubes or anything else.
You might find it easier to just remove it ad replace it with a spacer unit or remove it, pull out the valve itself so it's always open, and reinstall it.
Pro
Joined: May 2006
Posts: 567
Likes: 5
From: bradenton fl
i had wired it open by using coat hanger also. while in open position just wire to the 2 of the 3 studs on exhaust manifold, where exhaust pipe connects. this worked for me 6 yrs til i changed exhaust system
When i put new exhaust on. i dremmel cut the butterfly flaps off on the inside. thus keeping the factory look from outside.
When i put new exhaust on. i dremmel cut the butterfly flaps off on the inside. thus keeping the factory look from outside.
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 30,995
Likes: 98
From: Ontario
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Race Director
Joined: Apr 2003
Posts: 19,344
Likes: 654
From: Tampa, Florida
i had wired it open by using coat hanger also. while in open position just wire to the 2 of the 3 studs on exhaust manifold, where exhaust pipe connects. this worked for me 6 yrs til i changed exhaust system
When i put new exhaust on. i dremmel cut the butterfly flaps off on the inside. thus keeping the factory look from outside.
When i put new exhaust on. i dremmel cut the butterfly flaps off on the inside. thus keeping the factory look from outside.
Le Mans Master
Joined: Mar 2004
Posts: 7,423
Likes: 1,458
From: Little Rock AR
You can use the spacer that was originaly used on fuel injected Corvettes. It is the same size as the heat riser valve but has no butterfly or functional parts. A clean way to get rid of the valve and does no damage to the original parts. 
The coat hangar wire method is effective but not as "clean" - Bubba 
The later Corvettes used a spring loaded riser valve that will default into the fully open mode if the hose is removed or plugged. I have the hose plugged on my '80.
-Mark.
The coat hangar wire method is effective but not as "clean" - Bubba The later Corvettes used a spring loaded riser valve that will default into the fully open mode if the hose is removed or plugged. I have the hose plugged on my '80.
-Mark.
