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194377S100001 - 194377S122940 (coupe) 194677S100001 - 194677S122940 (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: 7 = 1967 7th Assembly Plant: S = St. Louis, MO. Last 6 digits Production Number starting with 100001 - 122940 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 (air conditioning, manual transmission, power steering) HR: 327ci, 300hp (air injection reactor, automatic transmission) HT: 327ci, 350hp (manual transmission) IL: 427ci, 390hp (manual transmission) IM: 427ci, 390hp (air injection reactor, manual transmission) IQ: 427ci, 390hp (automatic transmission) IR: 427ci, 390hp (air injection reactor, automatic transmission) IT: 427ci, 430hp (L88), (manual transmission) IU: 427ci, 435hp (aluminum heads, manual transmission) JA: 427ci, 435hp (air injection reactor, manual transmission) JC: 427ci, 400hp (manual transmission) JD: 427ci, 400hp (automatic transmission) JE: 427ci, 435hp (manual transmission) JF: 427ci, 400hp (air injection reactor, manual transmission) JG: 427ci, 400hp (air injection reactor, automatic transmission) JH: 427ci, 435hp (air injection reactor, aluminum heads, manual transmission) KH: 327ci, 350hp (air conditioning, air injection reactor, manual transmission, power steering) Block ID Numbers 3892657: 327ci 3904351: 427ci 3869942: 427ci (early production, unknown usage) 3916321: 427ci (late production, unknown use) Head ID Numbers 3890462: 327ci, 300hp, 350hp 3904390: 427ci, 390hp, 400hp (early production) 3904391: 427ci, 435hp (early production, iron heads) 3904392: 427ci, 430hp, 435hp (aluminum heads) 3909802: 427ci, 390hp, 400hp (late production) 3919840: 427ci, 435hp (iron heads, late production)

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data sheets need pposted 4021 of them in /sheets dir
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194377S100001 - 194377S122940 (coupe)
194677S100001 - 194677S122940 (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: 7 = 1967

7th
Assembly Plant: S = St. Louis, MO.

Last 6 digits
Production Number starting with 100001 - 122940




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 (air conditioning, manual transmission, power steering)

HR:
327ci, 300hp (air injection reactor, automatic transmission)

HT:
327ci, 350hp (manual transmission)

IL:
427ci, 390hp (manual transmission)

IM:
427ci, 390hp (air injection reactor, manual transmission)

IQ:
427ci, 390hp (automatic transmission)

IR:
427ci, 390hp (air injection reactor, automatic transmission)

IT:
427ci, 430hp (L88), (manual transmission)

IU:
427ci, 435hp (aluminum heads, manual transmission)

JA:
427ci, 435hp (air injection reactor, manual transmission)

JC:
427ci, 400hp (manual transmission)

JD:
427ci, 400hp (automatic transmission)

JE:
427ci, 435hp (manual transmission)

JF:
427ci, 400hp (air injection reactor, manual transmission)

JG:
427ci, 400hp (air injection reactor, automatic transmission)

JH:
427ci, 435hp (air injection reactor, aluminum heads, manual transmission)

KH:
327ci, 350hp (air conditioning, air injection reactor, manual transmission, power steering)




Block ID Numbers

3892657:
327ci

3904351:
427ci

3869942:
427ci (early production, unknown usage)

3916321:
427ci (late production, unknown use)




Head ID Numbers

3890462:
327ci, 300hp, 350hp

3904390:
427ci, 390hp, 400hp (early production)

3904391:
427ci, 435hp (early production, iron heads)

3904392:
427ci, 430hp, 435hp (aluminum heads)

3909802:
427ci, 390hp, 400hp (late production)

3919840:
427ci, 435hp (iron heads, late production)




1967-1969 L88 Engine Specifications
1967 1968 1969
General
SAE Gross Horsepower (advertised): 430 hp @ 5,200 rpm
SAE Net Torque (advertised): 460 ft. lbs @ 4,000 rpm
SAE Gross Horsepower (actual): Approx. 550 - 570 hp @ 6,200 - 6,400 rpm
SAE Net Torque (actual): Approx. 470 ft. lbs @ 5,200 rpm
Displacement: 427 CID, 6997 cc
Bore and Stroke: 4.251 in. x 3.760 in. (108.0 x 95.2 mm)
Compression Ratio:
Maximum:
Nominal:
12.8:1
12.5:1
12.9:1
12.0:1
Camshafts
P/N: 3928911 3928911
Casting No: 3928911 3928911
Base Circle 32.8 mm (1.291 in.) NA NA
Lobe Lift 9.9 mm (0.39 in.) NA NA
Supplier GM Bay City NA NA
Connecting Rods
Length: 6.135" NA NA
Crankcase
Descriptions Open deck 4-bolt fastening per bearing panel
Cylinder Head Volume: 103.3 114.8
Deck Clearance: .008
Deck Height 9.800 in.
Head Gasket Thickness (Compressed): .043
Head Gasket Volume: 10.81 cc
Min. Combustion Chamber Vol: 74.15 cc 73.47 cc
Crankshaft
Material: Forged premium alloy 5140 steel with "tuftride" surface coating
Cylinder Head
Casting Number: 3919842 3946074
Manufacturer: Winters Foundry NA NA
Material: Aluminum - (Early prototypes used cast iron)
Induction
Make / Type: 850 CFM Holley 1 x 4 bbl. D.D.
Material: Aluminum
Model No. - Auto. Trans: NA NA 3955205
Model No. - Man. Trans: 3925519 3955205
Intake Manifold Cast. No: 3885069 or 3933198 3933198
Lifter Type: Mechanical - Solid
Rocker Arm Ratio: 1.70:1 1.70:1
Pistons
Description: dome head valve cutout
Displacement of Dish/Dome, etc: 45.7 cc 51.7 cc
Height of Dome or
Depth of Dish: .454 .454
Manufacturer: TRW NA NA
Material: High-silicon-alloy aluminum NA NA
Timing
Check Cl: Intake: .020
Exhaust: .020 Intake: .020
Exhaust: .020
Opens: Intake: 61o BTC
Exhaust: 108o BBC Intake: 61o BTC
Exhaust: 108o BBC
Closes: Intake: 113o ABC
Exhaust: 72o ATC Intake: 113o ABC
Exhaust: 72o ATC
Overlap: Intake: 133o
Exhaust: Intake: 133o
Exhaust:
Duration: Intake: 332o
Exhaust: 333o Intake: 354o
Exhaust: 360o Intake: 354o
Exhaust: 360o
Lift: Intake: .560 @ .024 - lash
Exhaust: .580 @ .026 - lash Intake: .540 @ .022 - lash
Exhaust: .560 @ .024 - lash Intake: .540 @ .022 - lash
Exhaust: .560 @ .024 - lash
Springs
Outer Closed: Intake: 77 @ 1.88 Exhaust: 77 @ 1.88
Outer Open: Intake: 190 @ 1.344 Exhaust: 195 @ 1.324
Inner Closed: Intake: 43 @ 1.78 Exhaust: 43 @ 1.78
Inner Open: Intake: 100 @ 1.244 Exhaust: 103 @ 1.244
Valves
Head Diameter: Intake: 2.19 Exhaust: 1.88
Angle of Seat & Face: Intake: 45o Exhaust: 45o

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