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Mod | | | Forums66 Topics128,136 Posts1,056,428 Members48,441 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2014 Posts: 4,501 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,501 | I just used CLR to try to clean some crud out of the rear part of my 235. One of the warnings on the CLR bottle is "don't use on brass, copper or aluminum." Your head gasket could (like mine) be the copper sandwich type and your radiator is either brass/copper or your new radiator could be aluminum. Some of the new ones are. Muriatic acid and aluminum gives off hydrogen gas plus muriatic acid can and will dissolve aluminum.
I've been trying to figure out the best acid to use as a lower block cleaner (engine not running), but I haven't gotten much guidance yet. Hopefully somebody here knows the answer.
Good luck.
Jon
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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