Roller cam motors don't need breaking in... and if it's a crate LS3 just fire it off and go drive.
GREAT QUALITY SS headers are one thing.... not so great SS headers look nasty after awhile... so the answer is "all depends". Like many here - I like the look of good quality SS turning gold etc... but not so much the nasty stuff. They need coating.
The headers on my '32 are polished FOOD GRADE SS -- and when they first turned I didn't like it -- but I've gotten over that and now don't mind them colored.
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