The spray tube has I believe a guiding hole so it should only fit one-way. The rockers are on the manifold side of the head, so I it could spray to that side but rotation is in the other direction.

I would check it when you adjust the valves- remove it and make sure the wholes are clean and reinstall. Can't take but 15 minutes and the peace of mind is worth it!

I've done similar things for peace of mind which many cannot understand.

Michael

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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E