Ugly? How dare you call anything NASCO ugly!
All NASCO is beautiful and should be treated as gold and praise on it's beauty and function.
The first one is a Bosch and used in many cars of this period. They work well and are very similar to the NASCO version with twin doors common to FE-FC Holden's.
The last is a FB-EK Warm-a-ride and factory correct. This is the top of the range NASCO heater offered by GMH. They work extremely well in fact most people complain that they cook them too fast they are that good.
Of coarse this is relevant to your cooling system. I.E: It has the correct thermostat fitted, all hoses are clear, heater tap/valve works correctly etc.
The Warm-a-ride had a two speed fan and demister vents. It is vitally important that the cables that control the valves and vent are in good working order.
I must say I have never heard anyone complain about the warming factor of the NASCO Warmaride heater ever. But sadly now I have heard someone call them ugly.
BTW: Your "ugly" heater is worth somewhere between $200 to $500 on the open market if it is in good functioning order.
One more thing. Should you paint yours up like Devilrods it would looks shit hot!
Regards, Smooth
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