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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
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)