Headers vs Manifolds
Cargo Master
Joined: Nov 2007
Posts: 2,238
Likes: 475
If you live in florida probably correct. Here in colorado at MY house We had single digit temperatures from october until march. some single digit above 0*f and some below 0*f that is october-november-december-january-february-march, 6 months of near 0* weather. My welding truck in the mornings would start and run a few minutes to be warm and defrosted, my other 1978 f250 with a 400 would run almost 15 minutes until it was defrosted. The difference is the welding truck has the functioning flapper in the air cleaner sucking warm air from the exhaust manifold, the other one does not have that, and the other one has a fan clutch, (clutch fan) supposedly allowing slip to warm up while welding truck has direct fan, so DOES NOTHING may not be entirely accurate folks. just food for thought. the fuel used on warm up everyday may be worth repairing that system if you need it to defrost.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,260
Likes: 5,819
From: S/W Missouri, Polk county
Do not trash can those emissions parts, (the blue capped thingies), those are charcoal filters and can be needed by some people.
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Joined: Feb 2004
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From: The Shenandoah Valley
Logistics Pro
Joined: Jun 2004
Posts: 4,821
Likes: 3,426
From: South Central Utah
These came off my '76. The right side is the one on the top.
If they were both like the bottom one I doubt the I would have gone with a set of hedders
but the top one doesn't look like it flows the same as the bottom one.
So, I installed a set of hedders.
Logistics Pro
Joined: Oct 2006
Posts: 4,031
Likes: 891
From: East Central Ia
Your fuel tank vents into them. People label them as smog junk when they don't understand the system. They just store your fuel tank and carb gasoline vapors and when at operating temp and correct vacuum level {cruising, no load} the vapors are drawn into the intake manifold and burned by the engine. You must have all the components in place and operational. I doesn't require any HP. I as well as many were confused by all the hoses and valves of the day and just started pulling the systems out. But X3 on saving it.
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