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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 Engine - L82, 245hp
| Block | 3970010 | | 4 bolt main, suffix codes: CLJ, CLK, CLL, CLM |
Crankshaft | 330550 | | Forged steel |
Cylinder Head | 330545 | | 2.02/1.6" Valves, 76.18cc, tapered spark plug, screw in studs & guide plates |
Cam | 3896964 | | symbol: vertical diamond, GM part # 3896962 |
Intake | 3997771 | | Has oil shield, EGR, Intake Runners Numbered |
Carb (A/T) | 7043212 | | Rochester Quadrajet 4BBL, Remote Automatic Choke, w/Automatic Trans |
Carb (M/T) | 7043213 | | Rochester Quadrajet 4BBL, Remote Automatic Choke, w/Manual Trans |
Distributor | 1112148 | | Single Point, Uniset contact, RFI shield, Vacuum, Lite Blue paint spot |
RH Exhaust | 3986330 | | Log type, 2.026" outlet |
LH Exhaust | 3989041 | | Log 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 | 3970010 | | 4 bolt main, suffix codes: CLK, CLJ, CMS, CMT |
Crankshaft | 330550 | | Forged steel |
Cylinder Head | 333881 | | 2.02/1.6, 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) | 7044208 | | Rochester Quadrajet 4BBL, Remote Automatic Choke, w/Automatic Trans |
Carb (M/T) | 7044209 | | Rochester Quadrajet 4BBL, Remote Automatic Choke, w/Manual Trans |
Distributor | 1112148 | | Single Point, Uniset contact, RFI shield, Vacuum, Lite Blue paint spot |
Distributor | 1112528 | | HEI after 1/74, Vacuum, Lite Blue paint spot |
RH Exhaust | 3986330 | | Log type, 2.026" outlet |
LH Exhaust | 3989041 | | Log 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. |
