Casting : 3849852 = 57-66 283 Small block 2 bolt main
ID Code : F0303DE
DE = 283 195HP 295ftlbs 2bbl Powerglide
03 = March
03 = March 3rd

VIN: 1 38 37 5Z 132554
1 = Chevrolet
38 = Malibu SS (1965)
37 = 2 Door sport Coupe
5 = 65 or model year
Z = assembly plant : Fremont, CA
132554 = 122,554 chevelle made

Block Date Code : B225
B = Febuary A=January etc
22 = 22nd day of month
5 = 1965


All this look correct for my 65 Malibu SS for it to be numbers matching.

On the firewall Trim Tag, There should be 03B or 03C stamped in the upper left for this date engine.

I've got 03B. I assume for Feb 3rd?

2nd week of March.
01=Jan 02=Feb
A= 1st week B= 2nd week and so on.
Your Eng was build the first week of March, Your car was build the 2nd week of March, So it should be the correct Eng.

Originally posted by Adman:
132554 = 122,554 chevelle madeThe 32,554th Chevelle (all models) made at Fremont. Production sequence numbers started with 100001 for the first car and increased from there in all years except 1969 (300001), and 72 (500001).