Dohc
 

I have a 97 civic hx, and was wondering if there is any way to convert to DOHC without spending too much.

Moved to the engine section, rather than the Ride of the month section.

You need to swap the engine if you want DOHC. "Too much" is a relative term... just like "easy", "hard", "expensive".... the list goes on. Swaps are overly discussed already. Go do some reading.