[Joe A]

Does anyone know what the story is with the X's on the JL8 calipers my car is an original JL8 car and the front calipers are casting numbers X5469889X & 5469888X. I noticed some calipers have 1 X some have 2 and some have none. Any ideas?

[frankk]

My car has the X's also. I don't know for sure but I think the calipers without the X's may be from the Corvette. Hopefully Charlie will chime in.

[JohnZ]

Originally Posted by frankk

My car has the X's also. I don't know for sure but I think the calipers without the X's may be from the Corvette. Hopefully Charlie will chime in.

Nope. 1967-72 Corvette caliper castings were 5452270, 5452273, 5452281, and 5452284.

[frankk]

Then its a mystery to me also. There is no mention of it in Guinns book "Camaro untold secrets"

[jannes_z-28]

Didn't GM use X in early production stages for prototypes of different parts.
X would then mean Experimental.

Jan

[frankk]

The prototype parts and pieces were assigned O-dash numbers.