Originally Posted by Neal Miller

The latest date I have on any COX Engines is 4-19-1971, these are the A6-4 engines in the Box
Packaging. All of the engines in the boxes are from 1971.
All of the engines in the Blister Packs are from 1970, the C6-6 engines in the blister pack were not labeled for power rating or date of manufacture ? I think these are likely from 1970 also.