Headers
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Joined: Apr 2001
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Headers
Hey guys, my truck is an eighty six F-150 4x4 with a 300 six in it. I was thinking of putting a set of dual outlet headers from clifford on it. But I do not know if they will clear the bracket for the smog pump (which is gone) and altenator. Has anyone ever done this, and is there any other problems I could run into. I was also going to put in a new intake manifold and carb, and was wondering what kind of a difference it would make in performance, baisically is it worth it?
Junior User
Joined: Apr 2001
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Headers
If you have a smog carb, TFI-IV and eec, you can upgrade but be prepared to get creative if you need to keep it smog legal. The header is tight, but fits with no mods. I welded in O2 and air bungs to keep it legal.
I have the same year truck, and I went with Clifford header, port job, 260 deg. cam, Offy DP manifold and Holley 4160 600 cfm carb w/ #77 jets. Runs like a scared rabbit, but mileage is around 11-12 mpg. Everyone tells me the 600 is too big, but man it runs good. I'm looking for a Holley 390 to try and see if maybe I can get some more mpg's.
I have the same year truck, and I went with Clifford header, port job, 260 deg. cam, Offy DP manifold and Holley 4160 600 cfm carb w/ #77 jets. Runs like a scared rabbit, but mileage is around 11-12 mpg. Everyone tells me the 600 is too big, but man it runs good. I'm looking for a Holley 390 to try and see if maybe I can get some more mpg's.
Freshman User
Joined: Apr 2001
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Headers
I dont need to worry about keeping it smog leagal. Where I live in CA you only have to smog your truck one time when you first buy it and then you are done. Are you running the single or dual outlet headers? Did you have any problems getting them to seal up right when you put them on? Thanks
86
86
Junior User
Joined: Apr 2001
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Headers
Dual to a y-pipe, 2 1/4" cat and Summit turbo muffler, out the side in front of the passenger's side rear wheel. Sounds real good, especially when you get on it some. Didn't want the headache and $ of running two exhaust pipes, cats and mufflers.
No sealing problem. Used the Cliffy supplied gasket, painted both sides with Permatex copper gasket sealer. A couple of the bolts toward the front are a little tight to get to, helps if you pull off the alternator and air pump brackets.
If you go with the 4bbl manifold, set up a heat plate. Also, you'll need a spacer between the carb and the manifold.
No sealing problem. Used the Cliffy supplied gasket, painted both sides with Permatex copper gasket sealer. A couple of the bolts toward the front are a little tight to get to, helps if you pull off the alternator and air pump brackets.
If you go with the 4bbl manifold, set up a heat plate. Also, you'll need a spacer between the carb and the manifold.
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Joined: Apr 2001
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Headers
I liked the Offenhauser Dual Plane because it preserves the bottom end torque (one plane of the runner is for the primaries, the other for the secondaries). It looks cool and the price is reasonable. You can get one through Jegs.com. A heat plate is a water heater for the manifold plenum. Since you're running headers, there's no heat riser or "choke stove" to heat the intake, so without water heating, fuel doesn't vaporize well and your motor will have a cold stumble that'll be impossible to tune out. A heat plate bolts to the underside of the manifold, with inlet and outlet tubes that splice into your heater inlet hose. I had a machinist friend make mine out of aluminum billet, or you can buy one for around $75.
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