Rod...from a Chrysler?
Inward if it's an oil can, is still stretched.I put water and a little diluted dawn soap in a squirt bottle. I quench with that.
I banged areas I really shrunk down and areas that seemed like they were dented inward/ low but weren't directly part of the areas I worked on. If they were inward I figured that might mean they were over shrunk areas.
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If you can get a lot of inward with no oil canning bubbles, then you can carefully slap on dolly to work the shape back upwards.
Over shrunk is good.
Over stretched is bad.