This raises the question, where do you suggest is the best place to tap in and return the hot coolant? I'd guess at the head you'll get the hottest coolant.
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Originally Posted by Fattyman
1/2 5/16 for the fuel lines is correct. I like the 90 degree ones. But those are hard to find. You'll probably end up with a 1/2 to 3/8 reducer and then a 3/8 to 5/16 fitting.
For the hot water you'll need 1/2 to either 5/8 for the lower heater line at the boost pump and 1/2 to 3/4 for the upper heater line coming out of the head.
Get a cross flow going so the 2 fluids are traveling in opposite directions. You'll get better heat transfer.
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