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The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [62] while Vortec 8100's firing order is 1-8-7-2-6-5-4-3. Other upgrades of Vortec 8100 include 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.
It offers the airflow of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (the L31 has four bolts per head attaching the intake manifold, as opposed to the "traditional" six bolts per head found on older Chevrolet small-blocks). Chevrolet's L31 was replaced by GM's LS-based 5.3L LM7 and 6.0L LQ4.
Bore and stroke is 98 mm × 92 mm (3.9 in × 3.6 in). Output is 317–320 hp (236–239 kW; 321–324 PS) at 4,900 rpm with 522 to 533 N⋅m (385 to 393 lb⋅ft) of torque at 3,600 rpm. It has aluminum-alloy block and heads and low-friction molybdenum-coated pistons.
It also features higher flowing cylinder heads sourced from the L92, a more aggressive camshaft with 0.551 in (14 mm) lift, a 10.7:1 compression ratio, a revised valvetrain with 0.236 in (6 mm) offset intake rocker arms, a high-flow intake manifold, and 47 lb (21 kg)/hour fuel injectors from the LS7 engine.
A unique intake manifold that used the 48 mm (1.9 in) twin-bore throttle body from the 5.7L TPI Corvette engine was used on the engine's top end. [9] The turbocharged 4.3 L (262 cu in) was last used in the GMC Typhoon in the 1993 model year. The engine produced 280 hp (209 kW) at 4400 rpm and 360 lb⋅ft (488 N⋅m) of torque at 3600 rpm.
Other common issues are premature wear of engine lifters and camshafts as well as cam shaft adjusters. Common signs of this is a ticking noise at cold start of the vehicle. Other common issues consist of intake manifold failure, head bolt issues in models from 2007 to 2011 and drive belt pulleys.
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