I’d go with the mono valve. Did that and the heater blasted after that.
if it don’t blow black...take it back.
1982 300TDT 4 Speed
196K Standard Beige “VEGEWGN”. 300GD FW. Walbro FRC-8 Fuel Pump. ZadaTech LCD Boost, EGT, & Fuel Pressure gauge. Non-EGR Exhaust and Intake Manifold. 3/2 Valves gone. Soon to have Elsbett WVO conversion
1981 300D
314K Midnight Blue “The Blue Car”, Lovecrap system, owned 25 years+
1985 300TD White
198K “Betty White” Pure beauty
The VEGEWGN