To the Right are pictures of Our Stand Alone Vortec 8100 (RPO L18) is a V8 Truck engine. It is a redesigned Chevy Big Block Engine and was introduced with the 2001 full size Trucks. It is an all-iron engine (block and heads) with two valves per cylinder. It retains the same bore centers as the old 7.4 L big-blocks, but stroke was upped by 9.4 mm to reach 8.1L (496cuin) for a total of 107.95 mm bore and 111 mm stroke. Power output ranges from 325 hp (242 kW) to 550 horsepower (410 kW) and torque from 455 lbf·ft (617 N·m) to 690 lbf·ft (940 N·m). Vortec 8100s were built in Tondawanda New York. The Vortec 8100 is the engine used in the largest Uhaul, their 26-foot (7.9 m) truck. GM stopped installing big block V-8's in the Silverado HD trucks, when the GMT-800 series was discontinued in 2007. 8100 marine engines range from 400 to 600 hp and come with a stand-alone Engine Control Module (ECM). The last L18 was manufactured in December 2009.
Important differences between the Vortec 8100 and older big blocks include a changed firing order (1-8-7-2-6-5-4-3), a new 18-bolt head bolt pattern, different symmetrical intake ports, different oil pan rails and the use of metric threads throughout the engine. The fuel-injection system for the Vortec 8100 is nearly identical to that used on Gen III engines, right down to the fuel and spark tables in the ECU.
This is the "All Aluminum" L33 Engine to the Right
The L33 (VIN code "B") is an aluminum block version of the LM7, and was referred to as the Vortec 5300 HO in marketing materials. Power increased by 15 hp (11 kW), to 310 hp (230 kW), over the LM7, and torque was unchanged. It was only available on extended cab 4WD pickup trucks. Only 25% of trucks made in 2005 had the L33 engine.
5.3 Generation III
The Vortec 5300, or LM7/L59/LM4/L33, is a V8 Truck engine. It is a stroked (by 9 mm) version of the Vortec 4800 and replaced the 5700 L31. L59 denoted a flexible fuel version of the standard fuel LM7 engine.
Power output is 270-305 hp (313-320 kW) and torque is 315 lb·ft (427 N·m) to 335 lb·ft (454 N·m). Displacement is 5.3 L (5,328 cc (325.1 cu in)) from 96.01 mm 3.78 inch bore and 92.00 mm stroke 3.622 inch stroke . Vortec 5300s are built in St. Catharines, Ontario, Romulus, Michigan, and Silao, Mexicoo.
The LM7 (VIN code "T") Vortec 5300 was introduced in 1999, and can be considered the "garden variety" version of the Generation III 5.3 liter V8's. The LM7 has an iron block and aluminum heads.
The Vortec 6000, or LQ4, is a V8 truck engine. Displacement is 6.0 L (370 cu in) from 101.6 mm (4.0 in) bore and 92 mm (3.6 in) stroke 4.0-inch (100 mm) bore 3.622-inch (92.0 mm) stroke . It is an iron/aluminum (1999 & 2000 model year engines had cast iron heads) design and produces 300 hp (224 kW) to 325 and 360 lb·ft (488 N·m) to 370 lb·ft (502 N·m). LQ4s are built in Romulus, Michigan and Silao, Mexico.
The Vortec HO 6000 or VortecMAX is a special high-output version of the Vortec 6000 V8 truck engine originally designed for Cadillac. This engine was introduced in other truck lines as VortecMAX for 2006. It features high-compression (10:1) flat-top pistons for an extra 10 hp (7 kW) and 10 lb·ft (14 N·m), bringing output to 345 hp (257 kW) and 380 lb·ft (515 N·m). LQ9s are built only in Romulus, Michigan.
The Vortec 6000 LY6 is a Generation IV small block V8 truck engine. It shares the same bore and stroke as its LQ4 predecessor, and also features variable valve timing. 4.0 inch bore 3.622-inch (92.0 mm) stroke and 360 Horse Power!
The Vortec 4.8L V-8 (L20) is the entry-level V-8 engine. One of the enablers of the 4.8L's balance of performance and efficiency is great airflow throughout. The 4.8L is powerful and delivers exceptional refinement to go with great strength 302 hp ( 225 kW ) @ 5600 rpm SAE CERTIFIED