I see there are a number of sources for metal cooling system components for Supercharged XKs. Why is there no source for Normally Aspirated cars?
Is it because on a Supercharged car, the components are in a more "hostile" heat environment?

 

There are metal parts available. I think Euro Amp packages kits. I have not yet purchased any, and am only working from memory. I have seen evidence of some crappy cast parts.

 

For the record, I checked out the Euro Amp page.
Tons of stuff for the 5.0 and 3.0.
Nothing for the 4.2.