Review on COMP Cams 56 440 8 Camshaft 260AH R12 by Dany Hamilton

I bought this for my 2000 Chevy Blazer 4.3L V6. Runs but idle is erratic. The tachometer needle jumps randomly, and the engine stalls, then stalls. The mechanic eventually found that the cam sprocket didn't really match the OEM cam sprocket, there was a small gap between them. Thus, the wrong firing order is obtained. It can work well, but it needs to be modified by a highly technical person.