v-6 in early A-body

Bobscuda67, interesting on the frequency of timing chains before 100,000. The original on mine I changed at 175,000. The second one the new tensioner failed and the top of it slid off it's tab pushing the new chain against the oil drip tab. Replaced that set and it happened again after 1000 miles. Replaced oem style chain with cloyes racing double roller and took the tensioner off due to the design of the chain links I thought it would eat the tensioner up. Have run that double roller chain for over 100,000 miles now as my truck has 288,000 miles and still averages 20 mpg. Never did understand how the tensioner kept failing and slipping off its tab.