New Shiny Aluminum Radiator vs. 46 year old Brass


Jun 15, 2012
Florida Beach
Could you clarify what the lower driver hose barb is for?
On the LT1 that goes to the Water Pump. Not needed on the LS Engine. Cap it off.

At the time I went to the store and grabbed what hoses I thought would work, and made it work as you see. Don't have part numbers for any of them it was a visual judgment and the size I needed to fit on each end.

Me personally I'd use the LT1 Radiator all day, given it's factory designed for these engines and works with Fans too.
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Oct 1, 2022
There used to be radiator shop that rebuilt the brass radiators not nessesarily cheap anymore maybe it was referred to as rodding or re-rodding,where the tubes in the radiator were desoldered ( by gas flames ect) and replaced with new tubes of the appropriate length.....Just for informational recollection, I know you could solder off about 12 of the tubes (when leaking)WITHOUT AFFecting..cooling capacity range. Meaning if a bolt hit 3 tubes or a given number up to say 12 tubes and cut them", thus spewing water /antifreez like heck", you would pull out your needlenose pliers", and your ruby soldering flux ( kestor acid core?) Suggested oatey 50/50... heat the tube were it joins the brass end header ( collector comb) and twist the tube with the needle nose untill it came out of its socket then tin the end and fill hole in with the oatey/ Kester solder on each end of the damaged tubes ,( doing so quickly as not to deteiriorate the surrounding joints ?) Then not forgoing to pressure test the joints (low air pressure )before useing....while a single ding gravel chip to say 1 tube could usually be fixed with draining coolant ,and drying the hole with solvent like gumout/ acetone befor applying jb weld (12 hour version) and allowing to cure.. Oh yeah: I have one of the old brass jobbies laying in shed outside it might even be 4 core ( row) ect...If I had my choices about soldering' it would include a brass/ copper design instead of steel or aluminum ...
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Amateur Mechanic
Sep 24, 2020
69hurstolds looks like the tablets fixed my problem. I threw three tablets in two days ago and core support is now dry and overflow reservoir level is stable. I got about 70 miles on it no leaks. It just shows how new I am to this car building thing and how I'm living in a vacuum without help from this forum.

Everything's great except I rubbed my front passenger wheel's lip on the granite curb parking here in South Philly - like a woman. Mother F-er!!
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G-Body Guru
Mar 6, 2013
Northeastern PA
FWIW you can still get new copper brass rads from summit in their own brand.

I used one of the A body ones in my 71 lemans. It would have cost me $650-$700 about 3 years ago to have my original 2 core rad recored at a local shop. I got a 3 core summit brand one for half that. Fit just like the original Harrison rad and works great.
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