Advertise with the Corvette Action Center!

Join the Corvette Action Center on Facebook!

Follow the Corvette Action Center on Twitter!



Supporting Vendors / Dealers - Supporting Membership - Advertising Information - Corvette Amazon Shop


<< 1963 - 1967 Corvette Center
1968 - 1982 Corvette Center >>

1967 - 1969 L88 Corvette Engine Specifications

Print Friendly and PDF


l88 EngineThe following specifications come from a wide variety of resources. Because there has not been a lot of information published on the L88 engines over the years, it was difficult to take the bits and pieces we had from various sources and compile them into an easy to follow summary. Due to variations in the reported numbers between these resources, we cannot guarantee the accuracy of the information reported.

You will notice that in some cases, a specific piece of data is blank. We simply left the space blank because it was data that we did not have. As more information becomes available to us, we will update these specifications.



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

References:

  1. Automobile Quarterly, Third Quarter 1990, Volume 28, Number 3, pg. 322-333
  2. Best of Vette Vues Magazine, Volume One-Nine, May 1981
  3. Corvettes Technically Speaking, by Michael C. Harrison, 1st. Edition Limited, Copyright 1977

Join our Corvette Forums and get in on the action!


Dealers:

MacMulkin Chevrolet

Miscellaneous:

Carlisle Events

Parts/Accessories:

Corvette Central

Corvette Mods

VBP - Vette Brakes and Products - Corvette brake, suspension and steering kits. Springs, shocks, calipers, rotors, brake pads, ball joints, idler arms, sway bars,  and more.

Mid America Motorworks

Vetteskins


VetteTube: Premium Entertainment for Corvette Enthusiasts including videos, babes and more!
© CORVETTE is a registered trademark of the General Motors Corporation & Chevrolet Motor Division.  Neither Chevrolet Motor Division nor any subsidiaries of GM© shall bear any responsibility for CorvetteActionCenter.com content, comments, or advertising. CorvetteActionCenter.com is independent from GM© and is not affiliated with, sponsored or supported by GM©.  Copyright/trademark/sales mark infringements are not intended, or implied.  All Rights Reserved