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: 50,150
Likes: 5,783
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.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Hotshot
Joined: Feb 2004
Posts: 10,762
Likes: 2,590
From: The Shenandoah Valley
Logistics Pro
Joined: Jun 2004
Posts: 4,745
Likes: 3,355
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: 4,028
Likes: 890
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.
Thread
Thread Starter
Forum
Replies
Last Post
darren_palms
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
1
Mar 16, 2014 08:11 PM
rsalter66
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
2
May 16, 2013 09:45 PM
CanadianBigBlue460
1973 - 1979 F-100 & Larger F-Series Trucks
9
Mar 6, 2010 05:52 AM