napa heater cores are going to be aluminium. they have no give & are to far off to fit. here's a post I wrote last year.
well my new heater core is in and all went well. best place I found to buy it was advance auto. it looked identical and fit well(they were copper units) I did try napa but they were aluminum & the tubes coming out were to close together. they even ordered me another one but it was the same thing. and being aluminum there was no spreading them apart. the copper unit from advance auto had enough flex in them to make them work. I braced the two tubes like the factory but had to change it. you need to have some flex to get thru the firewall. once in the firewall everything got nice & ridged. also got to put in my new firewall insulation. that old one was trash. now I'll just need to start car tomorrow & hope to hell it don't leak the only problem I'm faced with is the cold to hot lever doesn't slide all the way to hot(and I checked it before putting heater box up & in). hope it's an easy fix cause I'm not dropping everything to see whats wrong. 1972 a/c car. that's my story & I'm sticking to it !
p.s. the lever wouldn't slide all the way because of a clip which I found:hurray:.
By way of update. I logged on to Advanced this morning to make another purchase and it rewarded me with another 20% off discount code. Check it out if you want to save some money. The heater core I received was all copper.
How's your firewall insulation on the inside? Silicone will probably work on the inside if you're gluing it to the firewall insulation pad. I don't like using silicone under the hood. I'd use 3M strip caulk which will remain more pliable.
Do you have the dash stripped out? The firewall pad will be impossible to install fully without it being bare. But yes, you do want insulation. You can use the factory style or aftermarket like hush mat or fat mans.
If you're trying to get something done today I'm told that big box hardware store sells an adhesive backed sound deadener. You could use enough of it around the heater box to get it installed and finish the balance later.
Well id like to have the underdash part done before it leaves for paint in a month or so. I get my heaterboxes this week. So i may order fatmat for 130 and do the entire floor minus the trunk and maybe the doors?
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