Do you know if the head or block has been decked?
May have been done if either was slightly warped before.
Just a thought, but that could account for the slackness in the chain.

Todd


1986 Pickup extracab longbed "Woody edition"
SAS - 33's, 5.29's, lockright rear.

02 IS300 SportCross - my "DD"
94 2wd v6 extracab
04 Outback Wagon- wife's/family car