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I have a friend that has a 400 small block and the car he has it in has had the heater box completely removed. My question is can he use a pipe plug and plug the heater hose fitting on the intake manifold and also use a pipe plug and plug the fitting on the top of the water pump or do you have to run a hose from the intake fitting to the water pump fitting? If he plugs both off will there be any heating issues that would be caused by plugging the fittings off? I think he can plug them off and be fine but I am not sure. Any replys would be great. Thanks
 

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Plug the holes... non-issue..won't hurt a thing. Been like that since I owned the car and swapped the motor in the first 3 months.

 
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