Anyone have a big block Exhaust manifold heat shield?

I don’t think I’ve ever seen one on a car, and a Mopar dealer on eBay I follow is selling them. I’ve got a 383, and live in crazy California, so would I need/want to have/add them? Are they necessary?

70 71 72 73 74 75 76 77 Mopar 383 400 440 Big Block Exhaust Manifold Heat Shield

Thx!

What car/engine do you have?

It collects heat to send into the air cleaner snorkel to help warm the engine. 1970 and newer without N96 or N94 fresh air hood.

R413 said:

What car/engine do you have?

It collects heat to send into the air cleaner snorkel to help warm the engine. 1970 and newer without N96 or N94 fresh air hood.

Click to expand...

1968 383 engine, 1971 Charger…. Will have 906 heads, hp exhaust headers. Custom valve covers via Leanna, CVR front end…. More?

I don't see how you would mount them if you're installing headers - and likely wouldn't fit anyway. The shield is mounted TO the stock exhaust manifold via two threaded studs and nuts. I think this is for stock applications, and not so much with what you're doing. (And your air cleaner housing would need to have the provisions to attach the "stove" or heat tube.)

71SandbugCharger said:

I don’t think I’ve ever seen one on a car, and a Mopar dealer on eBay I follow is selling them. I’ve got a 383, and live in crazy California, so would I need/want to have/add them? Are they necessary?

70 71 72 73 74 75 76 77 Mopar 383 400 440 Big Block Exhaust Manifold Heat Shield

Thx!

Click to expand...

Referring to 70 71 72 73 74 75 76 77 Mopar 383 400 440 Big Block Exhaust Manifold Heat Shield, the item is a heat stove, not a heat shield.

The heat stove is for collecting exhaust manifold external heat and routing it to the air inlet on the air cleaner, in conjuction with a flexible duct hose, a vacuum driven door in the air cleaner and a thermal sensor (thermostat) to control the vacuum actuator on the air cleaner inlet door, or flap.

This is done to maintain a certain level warm temperature for emissions, driveability and cold weather warmup.

The system was introduced in 1970 on most non-fresh air applications. The following images are from the 1970 Serviceability Highlights describing the system.




The one shown in the eBay listing is for a standard exhaust manifold. The high performance manifold version is the same in function, but different in configuration due to the difference in the manifolds.

The high performance manifold that mounts the stove has a ridge and two screw hole bosses cast into it as shown in the following image:

This is a 2951865 casting number 1970 - 1971 manifold.

The manifold stoves will not work with headers without a lot of adaptation. To use the factory air cleaner heated air system with headers, hot air kits that clamp to a header tube such as the Hedman 24514 are available:

FWIW my 70 Rover 3500S with the ex-buick 215 had the same heat riser to feed the 2 SU carbs. But...there is a vacuum valve that opens at full throttle, to let pure, cold air in, for max power! I probably have a photo somewhere.

Vaanth said:

Referring to 70 71 72 73 74 75 76 77 Mopar 383 400 440 Big Block Exhaust Manifold Heat Shield, the item is a heat stove, not a heat shield.

The heat stove is for collecting exhaust manifold external heat and routing it to the air inlet on the air cleaner, in conjuction with a flexible duct hose, a vacuum driven door in the air cleaner and a thermal sensor (thermostat) to control the vacuum actuator on the air cleaner inlet door, or flap.

This is done to maintain a certain level warm temperature for emissions, driveability and cold weather warmup.

The system was introduced in 1970 on most non-fresh air applications. The following images are from the 1970 Serviceability Highlights describing the system.
View attachment 1885299
View attachment 1885298
View attachment 1885302

The one shown in the eBay listing is for a standard exhaust manifold. The high performance manifold version is the same in function, but different in configuration due to the difference in the manifolds.

The high performance manifold that mounts the stove has a ridge and two screw hole bosses cast into it as shown in the following image:
View attachment 1885307
This is a 2951865 casting number 1970 - 1971 manifold.

The manifold stoves will not work with headers without a lot of adaptation. To use the factory air cleaner heated air system with headers, hot air kits that clamp to a header tube such as the Hedman 24514 are available:
View attachment 1885316

Click to expand...

This one appears to be 1 1/2”, don’t I need 2”?