Help with engine replacement
 

Hi everyone..I need some advice I'm new to the forum and r/c nitro...I got given to me a cen fun factor stadium truck..was all running fine then the engine went on me...I'm trying to source a second hand one for it..a nt-16..my question is..is there any other engine that will suit it maybe abit bigger than the one that came with it..or am I stuck with the original one..thanks in advance for any help