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With proper maintanence, the 4.3l vortec motors in the '94 and up S/T series trucks/suvs (S-10/Blazer/Sonoma/Jimmy/Envoy/Bravada) should be capable of well over 200k miles before needing any major internal engine repair. The main weak points on older, high-mileage 4.3l motors tend to be the fuel pump failures, and oil leaks from the oil cooler lines and the rear main seal.

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17y ago

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