CORVETTE ENGINE SERIES NUMBER AND SUFFIX CHART Cont VB I I 1955 I 39G 8 CYLINDER Tv Tvnc Description Designation Description Designation Spec High Performance IF Note Engines are stamped with a source production date and type on serial pad 1966 327 B CYLINDER Manual Tram I I HE Powerglidc HO A l R i HH Special High Performance i HT A R ar1d Pcwerglide HR Power Steering A i IP Soecial High Performance and A l FI HD Special High Performance C A C and A l R KH 427 8 CYLINDER 1 Special High Performance IHyd Lifters IK Special High Performance IP High Performance i IL Powerglide i IO A I R IM Powerglide and A I R IR Type Designations for some engines will be followed by an R Rochester or H Holly Carter to oesignate Carburetor requirements 1957 327 8 CYLINDER Manual Trans 4 HE Powerglide HO A I R HH Special High Performance HT A l R and Powerglide HR Power Steering Special High Performance and C A C HP Special High Performance and A l R HD Special High Performance C A C and A R KH 427 8 CYLINDER I 4 Spee I or Pcwcrglide IL A l R and Aluminum Heads i JH Tri Carb JC Powerglide t IO Special High Performance and Tri Carb JE Powerglide and Tri Carb JD Heavy Duty IT A I md Puwerglide IR Aluminum Heads IU A I R I verglide and Tri Carl JG A l R I IM A R Spenal Hiya Performance and A l l1 and Tri Carb JF Tri C JA i 1968 327 8 CYLINDER Manual Trans HE Hvd Steering and C A C HP 3Spet d Automatic Trans HO Special High Performance HT WAREHOUS NG AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORATION CHEVROLET 14A T 12 REV 12 B3 A I 3