Blocking off the manifold heat riser? How/what parts?
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Supreme Member
Joined: Jan 2002
Posts: 1,341
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From: Kona, Hawaii / Redlands, CA
Car: 91' RS
Engine: Built 355
Transmission: Probuilt 700r4
Blocking off the manifold heat riser? How/what parts?
Apparently my carb gets too hot. I'll be installing a different intake really soon so I'll block of the heat riser. I have a metal plate that came with my intake gaskets, but it has a hole in it. Is this what I need? or is the plate supposed to be solid, no holes? What side do I put it on passenger or driver, it's only on one side....right?
Thread Starter
Supreme Member
Joined: Jan 2002
Posts: 1,341
Likes: 0
From: Kona, Hawaii / Redlands, CA
Car: 91' RS
Engine: Built 355
Transmission: Probuilt 700r4
17 views huh.
Nonody knows how to do this? I thought it was a popular thing to do when the carb/intake manifold gets too hot.
Senior Member
Joined: Jun 2002
Posts: 558
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From: Bowling Green KY
Car: 87 IROC-Z
Engine: 350ci
Transmission: T-5
When I bought my intake gaskets I just asked for ones with blocked heat risers. Yours sound like they are a restricted riser. Maybe someone else can help more.
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I'm getting ready to reinstall the heads on the '57. The intake gaskets I have don't have the block-off plates. My plan is to cut some out of a tin can (not aluminum) and glue them in place when I get ready to install the intake.
Doesn't have to be anything fancy. As long as they aren't too thick so the gaskets still seal around the intake ports, and are still sitting there when you torque the manifold down, they'll do the job.
FWIW, the guy who did the valve job on the heads, who is probably the epitome of a "shade tree engineer", said that's what he does when the gasket set doesn't include block-off plates.
Doesn't have to be anything fancy. As long as they aren't too thick so the gaskets still seal around the intake ports, and are still sitting there when you torque the manifold down, they'll do the job.
FWIW, the guy who did the valve job on the heads, who is probably the epitome of a "shade tree engineer", said that's what he does when the gasket set doesn't include block-off plates.
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Use a piece of sheet metal. Like used the patch holes in body work. (.018/.022") Cut the pieces out to fit and cover the passages on the heads with a pair of tin snips and then tap down the edges with a hammer on the back of a vise.
For warm(er) weather you should block both sides.
The manifold gets plenty warm without this added heat.
HardCore HotRods
For warm(er) weather you should block both sides.
The manifold gets plenty warm without this added heat.
HardCore HotRods
Last edited by F-BIRD'88; Apr 1, 2003 at 03:55 PM.
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