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VIN Tag Information
194376S100001 - 194376S127720 (coupe)
194676S100001 - 194676S127720 (convertible)
Digit Definition
1st Division:  1 = Chevrolet
2nd / 3rd Series:  94 = Corvette
4th/5th Body Style:  37 = 2-door coupe, 67 = 2-door convertible
6th Model Year:  6 = 1966
7th Assembly Plant:  S = St. Louis, MO.
Last 6 digits Production Number starting with 100001 - 127720

Engine Suffix ID Numbers
HD: 327ci, 350hp (air injection reactor, manual transmission)
HE: 327ci, 300hp (manual transmission)
HH: 327ci, 300hp (air injection reactor, manual transmission)
HO: 327ci, 300hp (automatic transmission)
HP: 327ci, 350hp (manual transmission, power steering)
HR: 327ci, 300hp (air injection reactor, automatic transmission)
HT: 327ci, 350hp (manual transmission)
IK: 427ci, 425hp (manual transmission)
IL: 427ci, 390hp (manual transmission)
IM: 427ci, 390hp (air injection reactor, manual transmission)
IP: 427ci, 425hp/450hp (manual transmission)
IQ: 427ci, 390hp (automatic transmission)
IR: 427ci, 390hp (air injection reactor, automatic transmission)
KH: 327ci, 350hp (air conditioning, air injection reactor, manual transmission, power steering)

Block ID Numbers
3858174: 327ci
3869942: 427ci
3892657: 327ci (late production, unknown use)
3855961: 427ci (early production, unknown use)

Head ID Numbers
3782461: 327ci, 300hp, 350hp
3872702: 427ci, 390hp
3873858: 427ci, 450hp / 425hp

Carburetor ID Numbers
Holley R3247A #3886101: 427ci, 450hp / 425hp
Holley R3367A #3884505: 327ci, 300hp, 350hp
Holley R3370A #3882835: 427ci, 390hp
Holley R3605A #3890499: 327ci, 300hp, 350hp (air injection reactor)
Holley R3606A #3892341: 427ci, 390hp (air injection reactor)

Distributor ID Numbers
1111093: 427ci, 450hp / 425hp (transistor ignition)
1111141: 427ci, 390hp
1111142: 427ci, 390hp (transistor ignition)
1111153: 327ci, 300hp
1111156: 327ci, 350hp
1111157: 327ci, 350hp (transistor ignition)

Alternator ID Numbers
1100693: 327ci, 427ci
1100694: 327ci, 427ci (air conditioning)
1100696: 327ci, 427ci (transistor ignition, no A/C)
1100750: 327ci, 427ci (air conditioning)