HELP What Pistons are these for???

[cdn454LS6]

I have a part #3976027 LEFT
#3976028 RIGHT
Cast #39760 42 RIGHT
The top of the piston say's 2-.030
Boxes are dated nov69 for 454
Are these for LS6 or LS5
If anybody knows I would really appreciate some help.
Thanks very much.
Ken

[Mr70]

1970 LS-5 only.
1971 saw the birth of a new part# as well.

[cdn454LS6]

OK, Thanks for your help Rick
appriciate it very much.
Ken