Where are the body numbers on a 66 Barracuda?

Jim Lusk said
Nope. A is 65, B is 66, etc. This wasn't just on the 273. It was every engine put into any Chrysler car. PRior to that the letters were different. I don't remember how the '61 413 HP that I had was stamped.

Yup, your right. Here is some supporting data

Year letter or number

5-1965-A

6-1966-B

7-1967-C

8-1968-D

9-1969-E

0-70-F

1-71-G

2-72-H

3-73-I

4-74-K

5-75-L

6-74-M

7-75-N

8-78-O

9-79-p

0-80-R

Information