rustystud
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Those are the new "Sanderson" cast headers. They flow like a modern header but last like a original manifold since there cast iron. The top heater hose "T" goes to the radiator. It is a return line from the heater. The bottom hose has a clean-out fitting to help in purging out the old anti-freeze.Nice! What kind of headers are you using on this 383? Also what is the purpose of the t's in the heater hoses?