Just a quick plug for Simon at SPS, who can do chemically cleaned and bead blasted cam towers with the lettering machined to a polished finish rather than the usual cast ally rough finish. Including the towers coated in aircraft quality anti corrosion oil to stop them oxidising (he can also sell the chemical to apply once a year or so to keep it that way)
I expect he can also do them powder coated, as he has had a lot of the cam covers for 944 S2's on the engines he has built for us coated in original and non original colours... So he can probably do the 8v turbo and Lux cam towers in many combinations of powder coated towers with polished lettering, non powder coated with polished lettering, or even powder coated cam towers with the lettering in other colours (such as red cam tower with white lettering)
I guess the same would apply to other items, such as intake manifolds... Not to mention restoring under bonnet metal work (heat shields, brackets etc) to original finish (bead blasted and plated in gold silver etc)
He does not advertise this service, but his picky attention to detail eye, means he actually loves doing this kind of thing, not to mention it being a part of his business.
This is not an advertising post (he is a 100% independent business to mine) I am just recommending him, and I have NO idea what he would charge for this, but I expect he will chime in with some prices if there is interest.
If anyone wants to see what it looks like when done, just take a look at Paul's (Diver944's) 944 turbo (AKA LIL or the 3.2 beasty)... his cam tower has had the chemical cleaning, bead blasting and machining touch, along with the chemical protective treatment.... In fact, Nick's 968 3.0 turbo has had the same process..
Paul's engine bay also sports some other touches, such as the restored heat shields etc.
Sorry if this is seen as an Ad, but its just a recommendation for a fantastic restoration service.