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1990 - 1995 Corvette ZR-1 LT5 Engine Specifications

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LT5 Engine Specifications
  1990-1992 1993-1995
GENERAL
SAE Net Power 375 hp @ 6,000 rpm 405 hp @ 5,800 rpm
SAE Net Torque 370 ft lbs @ 4,800 rpm 385 ft lbs @ 4,800 rpm
Bore/Stroke 99 x 93 mm (3.90 in. x 3.66 in.) Carryover
Bore/Stroke Ratio 1.07:1 Carryover
Compression Ratio 11:1 Carryover
Displacement 349 cu in, 5727 cc Carryover
Firing Order 1,8,4,3,6,5,7,2 Carryover
Redline 7200 rpm Carryover
ACCESSORY DRIVE
Type Single poly "V" belt Carryover
Supplier Dayco Carryover
ALTERNATOR
Idle Output 50 amps Carryover
Max Output 120 amps Carryover
Supplier Delco Carryover
CAMSHAFT DRIVE
Description Primary drive-silent chain- Secondary drive-duplex roller chain Carryover
Supplier Borg Warner Carryover
CAMSHAFTS
Material Alloy cast iron Carryover
Base Circle 32.8 mm (1.291 in.) Carryover
Lobe Lift 9.9 mm (0.39 in.) Carryover
Supplier GM Bay City GM Bay City (design changes, 1993-95)
CHAIN TENSIONERS
Description Hydraulic Carryover
Supplier INA Carryover
COOLING SYSTEM
Type Pressurized Carryover
CONNECTING ROD
Material Forged steel Carryover
Length (CTR distance) 145.8 mm (5.74 in.) Carryover
Supplier Albon Engineering Albon Engineering (rods lightened, 1993-95)
CRANKCASE
Material Aluminum, with cast-in nodular cast iron bearing inserts Carryover
Description Ladder frame 2-bolt fastening per bearing panel Ladder frame 4-bolt fastening per bearing panel
CRANKSHAFT
Material Nitrided Carryover
Counterweights 6 Carryover
Crankpin Journal 53.33 mm (2.10 in.) Carryover
Crankpin Splay None Carryover
Thrust Position Bearing No. 3 Carryover
Main Journal Diameter 70.00 mm (2.76 in.) Carryover
Supplier Shardlow Carryover
CYLINDER CASE
Material Aluminum casting Carryover
Descriptions Open deck 2-bolt fastening per bearing panel Open deck 4-bolt fastening per bearing panel
Bore Spacing 111.76 mm (4.40 in.) Carryover
Deck Height 229.24 mm (9.03 in.) Carryover
Supplier Dennison Foundry GM Bedford
CYLINDER HEAD
Material Aluminum Carryover
Description Cross flow, fast burn, pent roof combustion chamber Carryover
Combustion Chamber Volume 40 cc Carryover
Gasket Composition (Goetze) Carryover
Supplier Birmal 1995 1/2 model year-A.L. Dunn (design changes 1993-95)
CYLINDER LINER
Material Forged aluminum Nikasil coated Carryover
Supplier Mahle Carryover
EXHAUST VALVE
Material VMS-478 Seat:VMS-590 Chrome flashed VMS-478 Seat:VMS-637 Chrome flashed
Overall Length 103.47 mm (4.07 in.) 102.97 mm (4.05 in.)
Head Diameter 35.2 mm (1.39 in.) Carryover
Angle Seat/Face 44 degree/45 degree Carryover
Stem Diameter 7.96 mm (0.314 in.) Carryover
Valve Angle 12 degree Carryover
Valve Seat Diameter 33 mm (1.30 in.) gauge diameter Carryover
Lift 9.9 mm (0.39 in.) Carryover
Supplier TRW Carryover
FLYWHEEL
Material Cast iron Carryover
Description Dual mass Carryover
Supplier LUK Carryover
FUEL RAIL
Material Extruded aluminum-multech injectors Extruded aluminum-multech injectors (commonized injectors, 1993-95)
Supplier AC Rochester Carryover
IGNITION COILS
Description Four-direct fire Carryover
Supplier Delco Carryover
INJECTOR HOUSINGS
Material Aluminum Carryover
Supplier Dennison Stahl (minor design change, 1993-95)
INLET VALVES
Material VMS-648 Flash chrome Carryover
Overall Length 103.17 mm (4.06 in.) 102.67 mm (4.04 in.)
Head Diameter 39 mm (1.54 in.) Carryover
Angle Seat/Face 44 degree/45 degree Carryover
Stem Diameter 7.96 mm (0.314 in.) Carryover
Valve Angle 10 degree Carryover
Valve Seat Diameter 37.2 mm (1.46 in.) gauge diameter Carryover
Lift 9.9 mm Carryover
Supplier TRW Carryover
LUBRICATION SYSTEM
Type Full flow. Temp regulated Carryover
Main and Con Rod Bearings Direct feed through center crank via cross drillings Carryover
Cam Bearings Forced through center cam Carryover
Piston Pins Splash Carryover
Cylinder Walls Splash Carryover
Total Capacity 12 1/2 qts Carryover
MAIN BEARINGS
Material Lead-indium overlay Carryover
Description Cast leaded bronze steel-backed Carryover
Supplier Vandervell Carryover
OIL PAN
Material Aluminum Carryover
Capacity 9.6 qts. Carryover
Supplier Stahl Specialty Stahl Specialty (design changed, 1993-95 model years)
OIL PUMP
Type Duo-centric-crankshaft driven Carryover
Pressure 50-60 psi Carryover
Temp Regulation Thermostat-Open-95 degree C Fully open-130 degree C Carryover
Capacity Idle-1.6 gpm 7,000 rpm-9.1 gpm Carryover
Supplier Presta SHW (minor design change, 1993-95 model years)
PISTON
Material Aluminum-cast Carryover
Description Expansion control-spherical bowl Carryover
Compression Height 36.5 mm (1.44 in.) Carryover
Supplier Mahle Mahle (piston strengthened, 1993-95)
PISTON PIN
Material Steel Carryover
Description Free Floating Carryover
Supplier Mahle Mahle (design revised, 1993-95)
PISTON RINGS
Top Compression Barrel-cast iron Plated-cast iron
Middle Compression Taper-cast iron Lapped-cast iron
Oil Control Cast iron-internal spring Lapped-cast iron-internal spring
Supplier Mahle (Goetze) Mahle (Goetze) (design revised, 1993-95)
PLENUM
Material Aluminum Carryover
Supplier Stahl Specialty Stahl Specialty (design changed, 1993-95 model years)
POWER STEERING PUMP
Type Engine mounted-reservoir Carryover
Supplier Saginaw Carryover
RADIATOR
Core Thickness 1.34 in. Carryover
Frontal Area 405 sq. in. Carryover
Radiator Cap 17 psi. Carryover
Thermostat Open 180 degree F Carryover
Fully Open 195 degree - 200 degree F Carryover
STARTER MOTOR
Type Gear reduction Carryover
Output 1.4 Kw Carryover
Supplier Delco Carryover
VALVE LIFTERS
Material Alloy cast iron Carryover
Type Hydraulic Carryover
Supplier AC Rochester Carryover
VALVE SPRINGS
Type Inner & outer opposed winding Carryover
Load-Closed 160-313 N (36-70 lbs.) Carryover
Load-Open 350-696 N (78-157 lbs.) Carryover
Supplier Tempered Spring Carryover
VALVE TRAIN
Description Direct acting Double overhead cam Carryover
WATER PUMP
Type Centifugal Carryover
Capacity 12 gpm @ idle 85 gpm @ 7,000 rpm Carryover
Supplier Ace (Casting) Carryover

Note:  All specifications are from pg. 182-185, "Heart of the Beast; History of the LT5 V-8 and ZR-1 Corvette" by Anthony Young, Copyright 1994, Automobile Quarterly, Inc.


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