Piston Identification 3994029 269-99 Big Block ?

[Ls648410]

Piston Identification 3994029 top stamp 269-99 bottom stamp Big Block ?
Tried searching the internet for identification for these but came up blank.
Anyone know what these are for ?

[daveg]

Bore size?

[Ls648410]

Bore size?

.030 written on the box by last owner

[daveg]

Bore size will tell you if 396, 402 or 427-454.
What is the bore size??

Pin placement will tell you if 427 or 454.

396 + .030= 402.

JAWAG but the lack of .030 on piston hints at 402.

[daveg]

One more try.

Yes they are BB Chev pistons.
Closed chamber so 1970 or older.
Would guess by high number 1970.

Post above shows how to tell what size engine they are for.