328 GTS Leaking heater core boxes what is the remedy here?

I'm also in nyc and use Fingers Radiators in North Brunswick Township, New Jersey.

Of course you'd have to remove the heater core from the car, but they can probably do a repair or create a replacement

 

Early cars like yours should have brass heater cores and should be repairable. Later cars like mine are aluminum and mine had green spots all over them. I had a local radiator shop that still had real radiator repairmen and they made me a pair. Wasn't even all that expensive. That was 15 or more years ago and there are fewer real radiator shops now but there are a few, especially if you go out into farm country.
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Maybe give these guys a call, they do all kinds of crazy repairs and custom work: https://www.oilcoolers.com/

 

I have to admit that my first reaction if that occurred on my 328 would be, "Do I really need a heater?"

I'm not saying that if it occurred I would actually bypass the core from system but the thought would be my first reaction since the number of times I have needed the heater in the 17 years I have owned the car is...zero.

 

Lucky you !! in case you do not use the heater, just connect the 2 hoses from the heater core with a brass tube.

 

Yeah...but I wish the AC worked better!!!

 

You may be surprised by the result, My heater valve was leaking, when I put in a manual valve in to block it off, I got 10 degree cooler air through the vents! 39 degree air from vintage Italian A/C is great!
Alden

 

I have not had them do a heater core but they did good work on a Pantera radiator and gas tank and a Ferrari radiator so a heater core should be doable.

 

If Ferrari was still offering them new they would be more expensive that that. Seems like in 2025 that isn't a terrible deal.
That radiator shop is gone as a result of Californias communities never ending quest to run out service/commercial living wage businesses in favor of more Starbucks locations. Community improvement don't you know.

 

This kit is for the 5/8" // 3/4" heater hoses found in many US cars - Don't know the sizes on your heater core hoses but this will give you the concept and if this doesn't work, you should be able to cobble together the right sized parts you'd need for the 328:

https://www.amazon.com/626-001-Upgrade-Aluminum-Engine-Heater/dp/B0DCNTGBWY/ref=sr_1_6?crid=1WFCNVUMFJL5G&dib=eyJ2IjoiMSJ9.v1mGV02U3Hti01rEMk9vWIDeyJH5oQJ1RS3aGOmhV6kuV6yazcOj087AozuzqmGHTZaaDiQS8i8XJQPUt8CgHg9UJgx51cShMBhYTXLsahFy8UydGB0OP4BpED1PhXVYcKjR9zGPeo25Nv_pa2vxU5BLwpxTcjBzI4uI3QO5sFOrdLtqfnasdXrE_QlXGhXJGcPmIf4P7-WR5OXVbSrr1wjMbNWMUBouOUev5fKRfK4.nLFfFhdwSKQ42IQfafwVv066oCJeLYzKUCrqSGPxEfA&dib_tag=se&keywords=heater+core+bypass+kit&qid=1750251645&sprefix=heater+core%2Caps%2C424&sr=8-6