Timing chain or belt

91 chev.150 1/2 ton ,does it have a timing chain or a belt? I tried to find it under some gates place on the comp. but no luck. I am sure some of you older mechanics must have the correct answer. Thanks.

The 4.3 V6, 5.0 (L03), and 5.7 (L05) V8s have timing chains.

Ed B.