heres the deal... i have a 94 ex cab w/ 2.4 ....the timing chain went on the first motor causing the head to warp...i was able to get a complete 88 truck for $300...put the motor in my truck.the motor looks like it was redone,but i realy dont know... never changed anything...started and ran great...minor leaks...ended up changing all the gaskets except the h-g...month and a 1/2 later it goes....thats the background info.# cylnder was running really hot. i think i have a leaky injector...the rest are all good..do you think i should rebuild the whole thing or just the h-g?

It depends on the budget you have, how much you can do yourself, and time restraints. If none of these apply then yes do a complete rebuild, and think about a performance based rebuild, i.e., bigger cyls. upgrading the cam, and maybe enlarging the valves. Or if on a limited budget, opt for just enlarging the cyls, the larger pistons wont cost anymore, jut the labor to bore the cyls. If you are limited by all 3 than just get the head inspected, replace any of the valves, and replace the HG.