Good to know Ill need a bit of high heat to get the T fittings out...

Do I have to pressure bleed the system after something like this, or will a traditional 2 man bleed suffice?

I am replacing all 5 hard lines.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car