header wrap? pro's / con's

How do you use a silicone before and after or before or after or what? Thank you
Only wrap headers on the White dart, because I use it for a mobile dyno. built the headers to be easy to pull, when swapping engines.
being wrapped makes plug checks less painful @ the track.

wrapped the manifold on the green dart, due to the master cylinder being so close.

to wrap the header, wrapped them while on an extra engine

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