Chevrolet Repair: Knocking on a Chevy S-10 Blazer, blazer chevrolet, fluid leaks

Question
Chevrolet
S-10 Blazer, '93, 2x4
4.3L Vortec

couple months back wound up having to replace the radiator. unfortunately had to push it a bit since it blew in the middle of a trip home round about 11pm. kept refilling however and made it only overheating once. replaced radiator and aside from a couple small oil and fluid leaks it appeared to be working fine, kept fluids checked and topped off didnt see any issue. got back today after an hour drive from orlando and as I stopped in my parking lot I realized it was knocking a bit while idling, no warning lights and didnt notice any drop off in performance. any suggestions?

Answer
could be heat warpage. check the head and then the cylnders you ight have pushed it too far. but check the spark knock sensor first, i can bet that needs repalced. it stop and retards 'spark knock' which sound like what you issue is. have that checked out and if it still runs good and no waring ok, BUT BE CAREFUL NEXT TIME!! dont push it ok// you may have to replace the engine next time.