I am new here and hope I am in right place I did a compression test on my 1991 350sdl ----------------------------------------------------------- # 1=460lb #2 =460lb #3=460lb # 4=515lb #5=505lb # 6=520lb Test was done on a warm motor about 20 min after shutdown Can anyone tell me if these numbers are in acceptale range. car runs rough and smokes white at startup and clears up when warm but seems to make to much noise. I swictched out injectors from my other 350sd that is real quiet and does not smoke. but in this car smoke and noise are to much. will injector pump timing solve this problem? Again what do compression numbers mean concerning this car? Thanks Any answers or suggestions please email me @ delco19064@yahoo.com