PleaseNote: This info is incomplete and Iam still trying to compile this list. I am trying to gatherinformation on decoding engine serial number identification prefixes(pre-1954) and suffixes (1954 - 1959) to add to this site. If you have any info that can beadded, please let me know.Thanks,LatestChanges/Additions/Corrections28 May2006 / 23 December 2004Pre - 1953 Chevrolet EngineSerial Number LocationEngine SerialNumber is Located on the right side of the engine on a boss just to therear of the ignition distributor for 216 and 235 c.i. Inline 6cylinder engines.

1. Ultima Engine Serial Number Locations

1947ENGINENUMBER is located on the right side ofthe block to the rear of the distributor. 1948ENGINENUMBER is located on the right side ofthe block to the rear of the distributor. 1949ENGINENUMBER is located on the right side ofthe block to the rear of the distributor. 1950ENGINENUMBER is located on the right side ofthe block to the rear of the distributor.

Engine numbers start at1001.Passenger CarsHAA HAMPassenger Car w/216ci EngineTrucksHAA HAMSeries 1500, 216ci Passenger EngineHAC HAPSeries 1500, 216ci Passenger Car Enginew/HD ClutchHBA HBMSeries 3100, 216ci Truck EngineBHCA BHCMSeries 3100, 216ci Truck Engine w/HD ClutchAHCF AHCMSeries 3600 & 3800, 216ci Truck EngineHAD HDA HEA or HEM????Prefixes ending in - AAAC BA CA CF were manufactured in Flint, MichiganPrefixes ending in - AMAP BM CM were manufactured in Tonawanda, New York. 1950 Truck Engine SpecificationsModel & CodePlantNo.CylindersCIDHPComp. RatioCarb.1500 SeriesHAAFlint6216926.6:11 BCHAMTonawanda6216926.6:11 BCHACFlint6216926.6:11 BCHAPTonawanda6216926.6:11 BC3100 SeriesHBAFlint6216926.6:11 BCHBMTonawanda6216926.6:11 BCBHCA.Flint6216926.6:11 BCBHCM.Tonawanda6216926.6:11 BC3600/3800 SeriesAHCF.Flint6235926.6:11 BCAHCM.Tonawanda6235926.6:11 BC. 'B' will precede prefix if R.P.O. On 3100series. 'A' will precede prefix if motor is usedon a 3600 and 3800 series.

Ultima Engine Serial Number Locations

1951ENGINENUMBER is located on the right side ofthe block to the rear of the distributor. Engine numbers start at1001.Passenger CarsJAA JAMPassenger Car w/216ci EngineTrucksJAA JAMSeries 1500, 216ci Passenger EngineJAC JAPSeries 1500, 216ci Passenger Car Enginew/HD ClutchJBA JBMSeries 3100, 216ci Truck EngineBJCA BJCMSeries 3100, 216ci Truck Engine w/HD ClutchAJCA N/AAJCMSeries 3600, 216ci Truck EngineJCD JCQSeries 3600 & 3800, 216 Truck Engine w/HydrovacBrake UnitJAD JDA JEA or JEM????Prefixes ending in - AAAC BA CA CD were manufactured in Flint, MichiganPrefixes ending in - AMAP BM CM CQ were manufactured in Tonawanda, New York.

1952ENGINENUMBER is located on the right side ofthe block to the rear of the distributor. Engine numbers start at1001.Passenger CarsKAA KAMPassenger Car w/216ci EngineTrucksKAA KAMSeries 1500, 216ci Passenger EngineKAC KAPSeries 1500, 216ci Passenger Car Enginew/HD ClutchKBA KBMSeries 3100, 216ci Truck EngineBKCA BKCMSeries 3100, 216ci Truck Engine w/HD ClutchAKCA AKCMSeries 3600 & 3800, 216ci Truck EngineAKCD AKCQSeries 3600 & 3800, 216 Truck Engine w/HydrovacBrake UnitKAD KDA KEA or KEM????Prefixes ending in - AAAC BA CA CD were manufactured in Flint, MichiganPrefixes ending in - AMAP BM CM CQ were manufactured in Tonawanda, New York. 1953ENGINENUMBER is located on the right side ofthe block to the rear of the distributor. 1954ENGINE NUMBERis located on the right side of the block to the rear of the distributor.Engine numbers start at 1001.The suffix letter afterthe engine code identifies the engine plant - 'F' Flint, 'T' Tonawanda.

'ZC' identifies heavy duty clutch,'ZH' aluminum camgear, 'ZE' power steering.Code:Size:HP:Description:Code:Size:HP:Description:Z235115Regular EngineZJ235w/Heavy-duty Clutch & Cam GearZC235115w/Heavy-duty ClutchY235125w/PowerglideZE235w/Power SteeringYG235150Corvette EngineZH235w/Aluminum Cam Gear. 19556-cylinder ENGINE NUMBERis located on the right side of the block to the rear of the distributor.8-cylinder ENGINE NUMBER is on pad on front right hand side of theblock behind the water pump. AllEngine numbers start at 1001. 1956 Engine SpecificationsModel / No. RatioCarb.One-Fifty62351408.0:11BC82 651 628.0:12BC82651 708.0:12BC82652059.25:14BC82652259.25:12x 4BCTwo-Ten62351408.0:11BC82 651 628.0:12BC82651 708.0:12BC82652059.25:14BC82652259.25:12x 4BCBel Air62351408.0:11BC82 651 628.0:12BC82651 708.0:12BC82652059.25:14BC82652259.25:12x 4BCCorvette826521652259.25:12x 482652409.25:12x 4.