Yes the silverado's have timing chains, just about all v6's and v8's have timing chains, and timing chains should not be serviced, unless you are having problems with a timing chain guide or timing chain tensioner
You dont change a timeing chain till its making a rattling noise
rubber cam belts you change at about 50,000miles
to find out what you have look under the hood,,,you will see a cover over the cam belt
SOURCE: just changed timing chain on 2000 silverado 4.3 wont start
PUT TIMIMG MARK ON TOP DEAD CENTER ,REMOVE DIST CAP AND SEE WHERE ROTOR IS POINTING IF IT IS 180 DEGREES OUT YOUR CAM SHAFT IS 180 OUT . IF THIS IS DISTLESS ING BRING #1 CYL TO TDC AND CK TIMNG MARKS. IF NOT LINED UP TOU ARE 180OUT ON THE GEARS
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