Definitely not a 4G52. It looks like it's off something like an early Mirage or Lancer...
Would make for a nice piece of wall art then.
Looks like a 4g15
it looks short to me even for a 4g15, might be that the picture is off somehow? it resembles the 4g15 cover with that bolt pattern. my guess, it came from an early carburated colt with a jet valves. or... it could be an extremely rare valve cover to a sirius dash 1.5l 3 valve motor that was only given to Executives for testing. (Just made this up to make it interesting btw).
hope it gets figured out.
When did they stop using Cyclone branding? They used that on engines that didn't even have Cyclone technology.
I think they used the Cyclone labelling on engines with jet valves as well. I did a google image search and this valve cover looks to be from a 4G13/15. Those engines look tiny compared to their big bro 4G5/4G6's.