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Wrapped my aftermarket UEL,then silicone sprayed it with DEI silicone spray. Finally coated just the back half of the oil pan (the side facing the header) with DEI Reflect-A-Gold sheet. Gotta keep the heat in the header and away/outside of the oil.
From what I've read (someplace), wrapping a header provides a significant advantage over coating (in terms of heat retention), but coating a header ensures no hot/cold spots from a poor/uneven wrap job which can cause metal/weld fatigue and even failure. Also coating protects against the kind of water damage that can occur if your wrapped header gets wet. This is what the DEI silicone spray helps to protect against. That is unless you submerge your wrapped header driving through an extremely flooded street.
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