Shine & Protect ?

Any ideas on polishing aluminum parts ?  And protect already shinny new valve covers, water pump/timing cover, Holley carb, intake ?  Mothers, Zoopseal/Shine Seal, Wolfgangs, Gords, Black Dimond, even Brasso,+ a dozen others?  Clear powder coat, Hi Temp clear, ceramic ?
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Lots of elbow grease you can clear them but after a while if you drive it much it the clear will start yellowing from the heat from the engine

I heard that sharkhide works good. I haven't tried it myself yet. I've been meaning to order some for a while just never can remember.

a bit of expense and uptake, but i just started getting decent with a product called kg gunkote. baked on finish similar to cerakote. either would work well, protect from chemicals. etc. i have a set i want to try to clear, as i haven't, will be interesting to see if leaving the smooth surface will adhere well or not. i just used brushed stainless for stock style rusty bolts on my motorcyle, not really stainless in appearance, but matches oem look of the bolts

Lots of motorcycle polishing products out their that work great

Chemical guys make a product to protect polished aluminum.

i know this isnt what you asked, but i painted my aluminum black. heads and block are blue. black carb.
my car is blue sheet metal with a black vinyl top and black four pin hood (the black hood and top looks good on mopars so i used it on mine). in the end it works pretty well.
i gave up on keeping aluminum clean. the black and blue looks nice. and much easier to clean and re-spray if needed.

The key is getting it to a mirror finish.  Sand with progressively finer grits until you think that it is perfect, then start polishing. You'd be surprised at how long it will retain a mirror finish if you remove all the bumps and pores.