Roy,
One of the reasons I was excited about GMC was to get the pressurized 228. When I bought the truck (decades ago now)the oil pressure was so low I pulled the pan to see what was going on. To my surprize, it didn't match the 228 repair manual nor did the pan gasket I bought for a 228 match the pan. That's when I found out some GMCs came with 216s or maybe someone replaced it with a 216. At any rate, the serial number of the engine is HBA335252. The HBA indicates it was built in 1950 but I haven't been able to find the 335252 in the lists I've been looking at. If you have any insight in the serial number above, I'd appreciate it.
I haven't had time to pull the pan to see what's going on yet, that wood pile needs attention before winter shows up. Thanks for the information, it's very much appreciated.
