I I V9 CORVETTE ENGINE SERIES NUMBER AND SUFFIX CHART Cont 1958 427 B CYLINDER Tv Tv Description Designation Description Designation High Performance IL Special High Performance Tri Carb IFI High Performance and Tri Carb IM Heavy Duty IT High Performance Tri Caro and 3S eed Special High Performance Tri Carb Automatic Trans IO and Aluminum Heads IU 3Speed Automatic Trans IO 1969 350 B CYLINDER High Performance HW Manual Trans HY High Performance C A C HX 35 eed Automatic Trans T H 400 HZ 427 8 CYLINDER High Performance 3Speed Tri Carb Special High Performance Automatic Trans T H 400 LL Heavy Duty Clutch LT High Performance LM Aluminum Heads Heavy Duty Clutch LU Tri Carb High Performance 3Speed Heavy Duty 3 Speed Automatic Automatic Trans T H 400 LN Trans T H 400 LV Heavy Duty LO Aluminum Heads 3Sp ed Automatic Aluminum Heads LP Trans T H 400 LW Tri Carb High Performance LO Tri Carb Special High Performance Tri Carl i Special High Performance LR 3 peed Automatic Trans T H 400 LX 1970 350 8 CYLINDER Manual Trans CTL High F erformance Transistor gnition C A C CTO 3 eed Automatic T H 400 CTM Special High Performance CTR High Performance L CT Special High Performance Transistor Ignition CTU High Performance C A C CTO Special High Performance Transistor Ignition High Performance Transistor Ignition CTP speed CTV 454 8 CYLINDER High Performance 4 BEL 3Speed 4 BBL Heavy Duty 3 Sp cd Automatic Automatic T H 400 CGW T H 400 CZN High Performance 4 BBL CZU High Performance 4 BBL Transistor 4 BBL Heavy Duty CZL lngition CRI WAREHOU5 NG AND DISTRIBUTION DIVISION OF GENERAL MOTORS CORPORATION CHEVROLET I4A REV 12y83 13 A I 4