Assume a character wielding a longsword and has Str 10, and a BAB of +1.Fist of Stone
You transform one of your hands into a mighty fist of living stone, gaining a +6 enhancement bonus to Strength for purposes of attacks, grapple checks, or breaking or crushing items.
NORMAL: Attack: +1; Damage: 1d8
Cast Fist of Stone
Attack: +4; Damage: 1d8
-or-
Attack: +4; Damage: 1d8+3
The text only says, "attacks", but I've never seen a Str enhancement that affects attacks not also affect damage; hence the question.