LS heads, cost for work.
- Thread starter copperhead
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there are guys who will put cast iron intake and exhaust manifolds in acid to eat off a little metal to open the ports up and make them a little lighter for race engines that have to keep the stock parts on an engine. Racers have been using those cheat parts for decades and still do until they get caught
https://www.castheads.com/manifolds-carb/intake-manifolds/acid-ported-intake-manifolds/
It's not acid, its hot caustic. It will clean them, but it takes the protective oxide layer off of aluminum right after the dirt is removed. It can screw parts up in a hurry.
Aluminum doesn't corrode because it builds a protective layer of oxide. Hot caustic can corrode aluminum.
Iron doesn't have a protective layer of oxide. Oxide on iron is Rust. So hot caustic is used to clean iron.
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