tttanker said:
I decided to change my heater core on my 78 with A/C since I'm putting a new dash in. Everything on removal went fine. Trouble I'm having now is finding the correct core to put back in. Every core I've searched are 2 " thick and the original one is 2 1/2" thick. Other dimensions are correct. The tubes on the 2" every vendor has are too far apart to pass thru the opening in the heater box it fits in. The tubes on the old one is 3 1/4" apart and new ones are 4 1/2 ". The aluminum housing won't take that much modification. If any has a good vendor for these please post. I'm still searching so I'll let you know if I find one. Not sure if yours had A/C.
So I had a very similar problem to yours back in 2012 - even down to the 2" vs 2 1/2" dimensions. Here's my thread that documents the problem - I eventually found the correct core on eBay.
|UPDATED|12/1/2016 12:18:03 AM (AZT)|/UPDATED|
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1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.