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Ram Air Housing to Inlet Manifold joint calls for Loctite 577 as a sealant. I’ve never seen this product. Is it what you guys use? Is something like UltraGrey Gasket sealer ok as a substitute? Maybe I need to order the Loctite from somewhere?

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577 is a thread sealant (https://www.henkel-adhesives.com/jp/en/product/thread-sealants/loctite_577.html) so not sure why they recommend that. For metal to metal faces I've always used Hylomar Blue.

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I used the 577 and is works well. It remains soft so fills all the imperfections.

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Thanks for the replies. I may use the UltraGrey which should be similar to the Hylomar.

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I used black Loctite silicone sealer on my one last time I did the job. I had the inlet manifold off changing the gasket so used that around the waterways and end seals on the gasket, made sense to use it as well on the plenum chamber.

Craig.

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Thanks Craig. I just installed it last night with Loctite Grey. Very slow progress right now with my current work schedule. I just need to get it together by ski season.