Heater core dimensions

[Steve-Avanti]

Greetings All,

My 77 has a tired original engine & it's getting rebuilt.  While it's out, I'm upgrading various issues that need attention.  The heater core has leaked for years & needs replacing.  Does anyone have dimensions for the original unit?  I've read that a 73-96 full size Chevy truck/Blazer etc. core is compatible.  Can anyone confirm this?  Thanks All!!

Steve

[mfg]

I interchanged a Dodge Aires heater core into a '64 Avanti years ago..

A close fit as far as I can remember.

[Steve-Avanti]

The ones I've seen from the various Avanti vendors are all over $320.  The Dodge Aries one you mentioned looks very different.  Avanti pics included here.

[mfg]

I remember that it had less capacity, however it seemed to function OK.

[Steve-Avanti]

Dimensions?

[mfg]

On 11/29/2022 at 8:38 PM, Steve-Avanti said:

Dimensions?

Don't have them, however I remember it fit the heater box without modification

[Steve-Avanti]

I finally got my old core out.  It was pretty leaky.  1 tube broke off as I yanked it out.  Dimensions are approximately:

Top to bottom 7 1/8"
Left to Right 9 1/2" Thickness 2 3/8"

I'm attempting to replace it with a non A/C 350 V8, 73-91 Chevy C10, full size Blazer etc. core with very similar dimensions & tube locations.  I'll follow up after I epoxy the brackets on.  Thx!  Steve

[Steve-Avanti]

So here's the replacement next to the old one.  Next up...epoxy new brackets on!!

[Kodjo]

Great find!

[mfg]

WOW....that looks like a winner to me!...and I bet it costs much less?

[Steve-Avanti]

$38.99 @ O'Reilly's👍

[mfg]

1 hour ago, Steve-Avanti said:

$38.99 @ O'Reilly's👍

UNREAL!...I'm going to order one for a spare.

[mfg]

Thank you for your detective work!

[Steve-Avanti]

It's normally $45 @ O'Reilly's but they price matched Summit's current sale which is $38.99 💰

[pantera928]

22 hours ago, Steve-Avanti said:

It's normally $45 @ O'Reilly's but they price matched Summit's current sale which is $38.99 💰

Please post photos of the end result. Thanks

[Steve-Avanti]

Spring is finally here in the Valley of the Sun (we had snow last week) so my heater core project resumes.  Today I'm going to JB weld the mounting brackets on. 

[Steve-Avanti]

Brackets attached.  Original had some sort of rubberized seal all around the edges.  Adding a a/c duct sealant so everything sits snug.

[pantera928]

So Steve

How is that heater core working out after a year?

Where did you get those angle brackets?

Thanks

Edited November 12, 2023 by pantera928

[Steve-Avanti]

On 11/12/2023 at 12:40 PM, pantera928 said:

So Steve

How is that heater core working out after a year?

Where did you get those angle brackets?

Thanks

Heater core is in but it was a total pain in the butt.  I had to grind & round off the bracket ends to get it to fit in the heater box.  Angle brackets were from angle iron used for garage door track.