The block casting number on the smaller engine is 10168588 and it also has “4.3” cast on the side. Several different versions of the LT1 were made, including a smaller displacement 4.3L L99 (offered in the 1994-’96 Caprice for better fuel economy). The connecting rods in the 1992-’94 LT1 engines are forged steel, while those in the 1995 and up engines are powdered metal. Consequently, if you are rebuilding one of these engines with an exchange crankshaft, make sure the crankshaft is the correct one for an LT1, not a 350. But the LT1 crank is balanced differently to accommodate lighter pistons. The crankshaft in the LT1 is similar to a small block 350 crank, and has the same casting number: 14088526. Though the LT1 has a different block and heads than the earlier small block Chevy V8, the engine mounts and bellhousing configuration were kept the same, allowing the newer Gen II engine to be swapped into older vehicles. Horsepower ratings for the various LT1 engines range from 260 hp to 300 hp depending on the model application and year.
It also got better fuel economy, making it a worthy successor to the long-lived small block Chevy.
Both blocks have the same 10125327 casting number.Ĭompared to the 1991 Chevy 350 L98 engine with Tuned Port Injection, the 1992 LT1 produced 20% more horsepower and a much broader torque curve. The Corvette block also has stronger four-bolt main caps while the rest have two-bolt mains. The LT1 has a cast iron cylinder block with aluminum heads in the Corvette, Camaro and Firebird applications, but cast iron heads on the Buick, Caprice, Cadillac and Impala models. The LT1 engine was used in a variety of General Motors models, including 1992-’96 Corvette (Y-body), 1993-’97 Camaro and Firebird (F-body), and 1994-’96 Chevy Caprice and Impala (B-body), Buick Roadmaster and Cadillac Fleetwood (D-body). Other differences from the earlier small block Chevy include a reverse-flow cooling system and mass airflow sequential fuel injection system (though early LT1s were equipped with a speed-density multiport fuel injection system). The most obvious difference that distinguishes the LT1 from these other engines is the front-mounted Opti-Spark ignition system.
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