I've used a product from Hapco (Fraser, Mi) That frees stuck lifters, etc... It worked great. I have only used it on my daily transportation cars and not on any performance vehicles. For my Mustang I would just do it right and replace all the lifters rather than put a band-aid on it.
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1988 Mustang GT
12.0 @ 121 on radials
S-trim Vortech sitting in a box!
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