EJCP.PARTS

GM 8.1 L18

The Vortec 8100 L18 was a V8 truck engine. It was a redesigned Chevrolet Big-Block engine and was introduced with the 2001 full-size pickup trucks. It had an all-iron engine (block and heads) with two valves per cylinder. It retained the same bore diameter as the old 7.4 L Big-Blocks, but the stroke was upped by 9.4 mm (0.37 in) to reach 8.1L (496cuin), for a total of 107.95 mm (4.25 in) bore and 111 mm (4.37 in) stroke. Power output ranged from 340 hp (254 kW) to 550 hp (410 kW),[citation needed] and torque from 455 lb·ft (617 N·m) to 690 lb·ft (936 N·m). Other 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, longer connecting rods, 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.[20] Vortec 8100s were built at GM's Tonawanda Engine plant. The last L18 was manufactured in December 2009.[WIKI]

SIZES BLOCK MATERIAL HEAD MATERIAL CAM TYPE FUEL SYSTEM
8.1 CAST IRON CAST IRON OHV MPFI

ITEMS

BRACKETS EXHAUST MANIFOLD INTAKE MANIFOLD OIL PAN PISTON
SENSORS TIMING COVER TIMING SET VALVE COVER VALVE INFORMATION

LISTING TEMPLATES

SIZES COMPATABILITY ENGINE TEMP HEAD TEMP CRANK TEMP NOTES
8.1 OHV 01-02 EXPRESS SAVANNA
01-03 SUBURBAN SIERRA SILVERADO YUKON
02-03 AVALANCHE
8.1B 8.1A ***** ***********
8.1 OHV 04-06 AVALANCHE YUKON XL SUBURBAN
04-07 SILVERADO SIERRA
8.1A 8.1A ***** ***********

VALVE INFORMATION

MAKE MODEL YEAR RANGE
CHEVROLET AVALANCHE 2002-2006
CHEVROLET EXPRESS 3500 2001-2002
CHEVROLET SILVERADO 2500 2001-2006
CHEVROLET SILVERADO 2500 CLASSIC 2007
CHEVROLET SILVERADO 3500 2001-2006
CHEVROLET SILVERADO 3500 CLASSIC 2007
CHEVROLET SUBURBAN 2500 2001-2006
GMC SAVANA 3500 2001-2002
GMC SIERRA 2500 2001-2006
GMC SIERRA 2500 CLASSIC 2007
GMC SIERRA 3500 2001-2006
GMC SIERRA CLASSIC 2007
GMC YUKON XL 2500 2001-2006
TYPE HEAD DIAMETER STEM DIAMETER O.A.L. GROOVES LOCATION
EXHAUST 43.7 9.4 137 1 *GM81AU
INTAKE 55.5 9.4 132.7 1 *GM81AU

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