NastyZ28.com - the most comprehensive numbers decoding site on the net   Camaro L82 Z28 Engine Specifications

The 1973 & 1974 Z28 engine (L82) is similar to the LT-1 with the following EXCEPTIONS: the intake manifold is cast iron with a Rochester quadrajet, the camshaft is hydraulic.
The cylinder head casting #'s differed, but the combustion chamber was 76.18cc for both years. Pistons were flat with a notch for valve clearance at high RPM. This combination yielded a 9.0:1 compression ratio. The air cleaner was either an open element 14" round air cleaner (1973) or the dual snorkle style air cleaner (1974). The 1974 dual snorkle air cleaner is unique in that it was smaller than previous years, and later in the year it was dimpled to accomodate the new HEI distributor.
1973 - 1974 L-82
1973 Z28 L82 - Click to view full size 1974 Z28 L82 - Click to view full size

1973 Z28 Engine - L82, 245hp
Block 39700104 bolt main, suffix codes: CLJ, CLK, CLL, CLM
Crankshaft 330550Forged steel
Cylinder Head 3305452.02/1.6" Valves, 76.18cc, tapered spark plug, screw in studs & guide plates
Cam 3896964 symbol: vertical diamond, GM part # 3896962
Intake 3997771Has oil shield, EGR, Intake Runners Numbered
Carb (A/T) 7043212Rochester Quadrajet 4BBL, Remote Automatic Choke, w/Automatic Trans
Carb (M/T) 7043213Rochester Quadrajet 4BBL, Remote Automatic Choke, w/Manual Trans
Distributor 1112148Single Point, Uniset contact, RFI shield, Vacuum, Lite Blue paint spot
RH Exhaust 3986330Log type, 2.026" outlet
LH Exhaust 3989041Log type, 2.026" outlet
Alternator: Delcotron 37 Amp, part # 1100934
Water Pump: 6263701

Cylinder heads have double pyramid casting mark.
Cam specs: Hydraulic, Lift: .450/.460 (intake/exhaust), Duration: 346/360 (i/e), with 1.5 rockers.
Engine block: Nearly every 350 you'll come across is casting # 3970010, some are 2 bolt, some are 4 bolt. Some are regular, some are 010, some are 010/020 (10-20 blocks). Check the suffix code to see what application the block is actually from. All Z28 blocks should be 4 bolt mains.

Note: Some 1973 Camaros had a 1972 external voltage regulator. This occured before February 1973.

Photo Details:
Engine Suffix & Partial VIN - 1973 Z28
Cylinder head Casting Symbol (double pyramid) | Casting Number | Combustion Chamber

1974 Z28 Engine - L82 245hp
Block 39700104 bolt main, suffix codes: CLK, CLJ, CMS, CMT
Crankshaft 330550Forged steel
Cylinder Head 3338812.02/1.6, 76.18cc, identical to 333882, except w/bigger valves, screw in studs & guide plates
Cam 3896964 symbol: vertical diamond, Identical to 1973
Intake 340261
Carb (A/T) 7044208Rochester Quadrajet 4BBL, Remote Automatic Choke, w/Automatic Trans
Carb (M/T) 7044209Rochester Quadrajet 4BBL, Remote Automatic Choke, w/Manual Trans
Distributor 1112148Single Point, Uniset contact, RFI shield, Vacuum, Lite Blue paint spot
Distributor 1112528HEI after 1/74, Vacuum, Lite Blue paint spot
RH Exhaust 3986330Log type, 2.026" outlet
LH Exhaust 3989041Log type, 2.026" outlet
Alternator: Delcotron 37 Amp, part # 1102397
Water Pump: 6263701

Cam specs: Hydraulic, Lift: .450/.460 (intake/exhaust), Duration: 346/360 (i/e), with 1.5 rockers.
Distributor Note: 3123 Z28's were built after January 74 with the HEI distributor. Prior to this the Z28 had the same distributor as the 1973 Z28.


Last updated: 10/20/2011
Author: MadMike Maciolek

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