If the truck has A/C,one goes to the rad. the other to the water pump.(3/4" hose to the rad.)
No A/C and both go to the pump.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension.
Petrolia,Ontario,Canada but working in Port Huron,MI.
See ALL my Blazer pic's HERE
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