Re: combustion in the coolant?
When I do LS swap into whatever I like to mount the radiator with the rubber u-saddles top and bottom not "L" brackets welded on the side tanks. Pic of my 68 using a generic LS Afco dual pass radiator.
Having said that on my LS6 swapped 98 Wrangler the radiator is a side mount but has a rubber insulator between the mount and the tanks. No issues for 15 years.
See pic.
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