GMC Vortec 4200 (4.2L I6) Engine Specs

Bore, stroke, displacement and compression for all 1 GMC Vortec 4200 (4.2L I6) engines. Compare variants side by side.

Engine	Displacement	Bore × Stroke	CR	HP
LL8	256 ci	3.6614" × 4.0157"	10:1	275–291

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