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  1. J

    Overheating climbing a mountain

    Hello, I’m a longtime reader, first time poster. My 1978 K25 resto project is running great, but it overheats when driving up the Sierra Nevada mountains. Tech stuff: -383 SBC (mercury marine block) -9.5:1 compression -Moderate cam (boat cam) -Summit iron vortec heads. 64cc chambers...

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