Anyone recognize this gasket? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**71CHEVYSHORTBED402** · 08-25-2021, 01:00 PM

I'm installing the original A/C/Heat system in my 71. This gasket came with the kit though I don't recognize it. It's about the same size as the heater core, but I don't believe they take a gasket, the heater box does however.

It's not for the evaporator core, that takes a larger rectangular gasket. Doesn't fit on the heater box, A/C diverter or floor duct. Hmmm!

Thank you

**71CHEVYSHORTBED402** · 08-25-2021, 01:10 PM

For what worth this first illustration doesn't show it. The second one might.

What's not shown so much is the rope gasket that runs along the perimeter for the joint between both sides of the evap. case.

**StingRay** · 08-25-2021, 01:35 PM

I believe that is the core to box gasket. And that's where one just went on my one ton.

**71CHEVYSHORTBED402** · 08-25-2021, 01:51 PM

Quote:

Originally Posted by StingRay

I believe that is the core to box gasket. And that's where one just went on my one ton.

Which core? If you mean evaporator core, such as shown in the first illustration above, that takes a larger rectangular gasket.

un4gvn! · 08-25-2021, 02:45 PM

Before you install the heater core, you glue this gasket in the opening before you tighten the heater core to the box.

**71CHEVYSHORTBED402** · 08-25-2021, 02:55 PM

Quote:

Originally Posted by un4gvn!

Before you install the heater core, you glue this gasket in the opening before you tighten the heater core to the box.

What I think you said is, I need to remove the heater box and do it right..........Ahhhhhhhhhhh!. I didn't know I had the gasket, bought these five years ago, just happened to come across this one

, and the heater core didn't have one when I found it.

I like to do things twice.

Speak of heater boxes, I discovered the first time that "The Fonze" has its place here.

**71CHEVYSHORTBED402** · 08-25-2021, 03:47 PM

Neat how the gasket is maybe 3/8" too narrow for the passage. I have some extra rope gasket I can make work. Thank you.

Scratch that, I'm using tape of sorts instead, this gasket doesn't come close to fitting. All the other gaskets are great, might be a case so few install them for a heater core the vendors don't know they're worthless.

08-25-2021, 01:00 PM	#1
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,385	Anyone recognize this gasket? I'm installing the original A/C/Heat system in my 71. This gasket came with the kit though I don't recognize it. It's about the same size as the heater core, but I don't believe they take a gasket, the heater box does however. It's not for the evaporator core, that takes a larger rectangular gasket. Doesn't fit on the heater box, A/C diverter or floor duct. Hmmm! Thank you Attached Images __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

08-25-2021, 01:10 PM	#2
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,385	Re: Anyone recognize this gasket? For what worth this first illustration doesn't show it. The second one might. What's not shown so much is the rope gasket that runs along the perimeter for the joint between both sides of the evap. case. Attached Images __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025

08-25-2021, 01:35 PM	#3
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,487	Re: Anyone recognize this gasket? I believe that is the core to box gasket. And that's where one just went on my one ton. __________________ Saskatoon, Saskatchewan Canada

08-25-2021, 02:45 PM	#5
un4gvn! Registered User Join Date: Mar 2006 Location: Latrobe, Pa. 15650 Posts: 355	Re: Anyone recognize this gasket? Before you install the heater core, you glue this gasket in the opening before you tighten the heater core to the box.

08-25-2021, 03:47 PM	#7
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,385	Re: Anyone recognize this gasket? Neat how the gasket is maybe 3/8" too narrow for the passage. I have some extra rope gasket I can make work. Thank you. Scratch that, I'm using tape of sorts instead, this gasket doesn't come close to fitting. All the other gaskets are great, might be a case so few install them for a heater core the vendors don't know they're worthless. Attached Images __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 08-25-2021 at 04:20 PM.



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