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Old 09-27-2018, 08:49 PM   #1
Brentwe
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1966 k10 heater core

My new to me 66 short had a bad rad cap, replaced it and very shortly there after started smelling a bit of coolant. Any who, heater core is shot and thanks to the help on this forum for directions on heat box removal.
For those into this, there is a couple of sizes of cores, 7 inch and 9 1/2 inches long. Check the specs before you order. 2nd one on order now.
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Old 09-29-2018, 10:01 PM   #2
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Re: 1966 k10 heater core

New one arrived today, install required grinding out the slots on the 3/4 inch outlet for clearance. The spacing between the 2 pipes was not quite factory The heat is on.
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Old 10-01-2018, 02:50 PM   #3
87warrior
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Re: 1966 k10 heater core

My K20 is in need of a new heater core as well. Is it possible to determine which size core I need without removing the heater box 'lid'?

Where did you go for the new heater core?
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Old 10-02-2018, 12:22 AM   #4
Captainfab
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Re: 1966 k10 heater core

Typically the Economy heater has the smaller core and the Deluxe heater has the larger core.

Quote:
Originally Posted by 87warrior View Post
My K20 is in need of a new heater core as well. Is it possible to determine which size core I need without removing the heater box 'lid'?

Where did you go for the new heater core?
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Old 10-02-2018, 01:15 AM   #5
Brentwe
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Re: 1966 k10 heater core

The above is correct, but you can pull the top off the unit easy enough and see the coil, can't remove it until the box is removed, it comes out from below. But you will see enough to measure the length.
The deluxe (9 inch) is Spectra Premium 94691, local shop ordered it, I think Spectra is a fairly common brand.
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Old 10-02-2018, 10:04 AM   #6
LT1 Burb
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Re: 1966 k10 heater core

I took my original heater core in and had the tanks unsweated on both the repop and old ones and then swapped them. I couldn't take the fit and it would have irritated me.
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Old 10-03-2018, 12:29 AM   #7
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Re: 1966 k10 heater core

Looks good.
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