Re: 72 k20 project
Look into a product named Red-Kote for the inside of tank. I used it on my modded 69 Camaro gas tank for about a year without any issues. The ethanol in todays fuels will cause the Red-Kote to lose it's pigment but not it's protection. I had the local radiator shop line it for about $40. They even brazed in a drain into the tank.
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