Added heat to my header'd -4 Options

[geniusanthony]

So this weekend I did a lot of tinkering to put my curiosity to bed on heating a car with headers. I remember reading from Dan Root's -6 conversion thread that he welded some pipe to his headers and pushed air through with a stock heater fan.

Sorry no pics now but, I can explain somewhat. I tacked a bent pipe in perhaps 20 places along the length of this bent pipe to the left hand primary tubes. I did insulate the header plus pipe in 1" header wrap. When I attached the blower and ran at idle for maybe 10 minutes I measured the duct surface temp at the driver footwell to be 87 deg. with a good supply of air flowing out. I do think that perhaps the dual oulet blower ( 1 side is capped) from an early car does blow a bit too hard and may need to throttle down that motor or perhaps replace with a bilge blower.

I do realize that this is not ideal and the C0_1 hazard but these are not permanent and I will inspect in the spring when defrost is no longer needed for corrosion etc..

Now, if I do replace the fan or throttle it down, more heat soak should occur between the heater pipe and the air traveling through. Additionally I have not road tested only idled so I anticipate more heat as I piddle around town regardless of cfm through the hose.

Does anyone have an idea about how much cfm the 71 dual oulet blower should blow?

[Rod]

Do you really think that the original fan blows 250cfm??

I would be very curious to know as I have a one sided heating system (passenger side capped off) and I really want to improve the heating so I can use the car in the winter more..

I'm thinking of two bilge blowers instead of the original fan, but I can find bilge blowers with 100cfm and am now wondering if they would be up for the job?

With regards your want for heat on headers, I would use a larger flexible aluminium tube (large enough to swallow the header) fitted over a length of pipe, have a fan BLOW the air through it and then connect to the heat pipes in the sills. no need for the flapper boxes then as it is now using the engine fan to blow heat, so when you want heat, just turn the fan(s) on..