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Old 09-20-2020, 10:52 AM   #1
Join Date: Jun 2015
Posts: 62
Need help identifying a P30 exhaust part

What is the correct name of the part bolted between the pieces of exhaust pipe? It is cracked and crumbling, I would like to replace it. Itís linkage is controlled by that vacuum valve. Itís on a 1987 P30.
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1987 Establishment
P30 chassis 7.4L 454 V8
Rochester Quadrajet carb
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Old 09-20-2020, 04:15 PM   #2
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Looks like a exhaust brake.
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Old 09-20-2020, 06:02 PM   #3
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Heat Riser
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Old 09-20-2020, 06:21 PM   #4
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That piece is used to restrict exhaust flow during cold engine warm-up. The exhaust restrictions helps to heat up the intake manifold and help keep the fuel atomized. If your engine warms up and runs good, you can remove it at an exhaust shop and either have a short pipe fitted, have a bypass install or weld in a new down pipe.
This also is only if your state does not require an emissions inspection.
Always bring your A game.
1996 Flair 29V, 454 TBI, 4L80E
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Old 09-20-2020, 06:56 PM   #5
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It's a Heat Riser Valve used to direct the exhaust gasses through a passage in the intake manifold to speed up engine warm up. Once the engine warms up , the valve opens. It will not harm the engine to run it with the valve removed.
A more common problem is the valve sticks closed and overheats the intake manifold causing a loss in power.
1993 Tiffin Allegro Bay 32'
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Old 09-24-2020, 01:28 PM   #6
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It's also a common problem the gasket burns out. I removed that part and bolted the pipes together, there was enough pipe to do it. I used a gasket that was flat on one side and a cone on the other. Do this mod to make plug wires and that right side exhaust run cooler. This is a chevy factory service bulletin for a 454 in a motorhome:
2000 Southwind 32v and a 03 Tracker 5 speed 2WD toad, Roadmaster off road tow bar & 2" drop hitch
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exhaust, need help, p30

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