L is December (or maybe November, I can't remember if they used I). A = January, B = February, etc.
7 is the 7th day of the month. If the day of month was 10 or more there would be 2 digits.
0 is the last digit of the year. 216 engines were built in 1940 and 1950.

This manifold did not leave the factory in your truck If your truck is a 1949 model.

Last edited by Bill Hanlon; 07/15/2024 5:16 PM.

'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.