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Will a LS1 bolt to 1997 4L60E transmission?

No, a LS1 engine will not directly bolt to a 1997 4L60E transmission. The LS1 uses a different bellhousing bolt pattern than the transmissions used behind the older small-block Chevy engines (like the ones the 1997 4L60E was originally mated to). You'll need an adapter plate to mate the two.