20.639 Corvettes were built in 1991. 14.967 Coupes and 5.672 Convertibles
The Vehicle Identification Numbers, VIN were 1G1YY2386M5100001 through 1G1YY2386M5118595
The Vehicle Identification Numbers, VIN were 1G1YZ23J6M5800001 through 1G1YZ23J6M5802044 (ZR1)
For Convertibles, sixth digit is a 3
Ninth digit is a check code and varies

Cubic Inch 350 - ID/VIN 8 350 - ID/VIN J
Net HP @ RPM 245 @ 4000 375 @ 5800
Net Torque @ RPM 345 @ 3200 370 @ 5600
Comp. Ratio 10.25:1 11.0:1
Bore & Stroke 4.000x3.480 3.90 x 3.66
Fuel System TPI - Tuned Port Injection MFI
Valve Lifters Hydraulic Hydraulic
Exhaust NIY NIY
Oil Capacity 4 QT 4 QT
Oil Pressure @ RPM 50-65 @ 2000 60 @ 1850
10153558 350 CID - 375 HP
14093638 350 CID - 245 HP / 250 HP
10088113 350 CID - 245 HP / 250 HP
10174390 350 CID - 375 HP (Right)
10174389 350 CID - 375 HP (Left)
350 Cubic Inch Engine CODE
245 HP / 250 HP with Automatic transmission ZTA
245 HP / 250 HP with Manual transmission - Engine Oil Cooler ZTB
245 HP / 250 HP with Automatic transmission - Engine Oil Cooler ZTC
375 HP ZTK
Ratio and Type CODE
NIY NIY
NIY NIY
Color CODE
White 10
Steel Blue Metallic 25
Yellow 35
Black 41
Turquoise Metallic 42
Dark Red Metallic 75
Quasar Blue Metallic 80
Bright Red 81
Polo Green Metallic 91
Charcoal Metallic 96
© Tommy Ledberg