Exhaust Manifold
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Joined: Mar 2000
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Exhaust Manifold
I have managed to somehow crack one of my exhaust manifolds on my 91 F-150 4.9 L. I need to know how big of a pain in the *** it is to remove and replace them. My Haynes manual is very short of info on this. Also, I need to know where to get them for a decent price. O'Rielly Auto Parts has both front and rear manifolds for $240.00. Is this a good price or should I go with Headers?
Postmaster
Joined: Jul 1999
Posts: 3,172
Likes: 4
Exhaust Manifold
Adam ,
The intake and exhaust manifolds share bolts on the 300 . Its not too hard to remove them ...getting them back together requires a little more patience . You can hang the exhaust manifolds on their own bolts while you position and reinstall the intake . Have a good torque wrench and be very careful tightening the bolts and torque them in the proper sequence .Its about a 2 hr job with the right tools . I think Clifford Performance Parts make headers for your engine. Good luck ,
Paul
The intake and exhaust manifolds share bolts on the 300 . Its not too hard to remove them ...getting them back together requires a little more patience . You can hang the exhaust manifolds on their own bolts while you position and reinstall the intake . Have a good torque wrench and be very careful tightening the bolts and torque them in the proper sequence .Its about a 2 hr job with the right tools . I think Clifford Performance Parts make headers for your engine. Good luck ,
Paul
Freshman User
Joined: Mar 2000
Posts: 42
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Exhaust Manifold
REPLACING MANIFOLDS INVLOLVES, FIRST UNBOLTING, THE PIPE FROM THE COLLECTOR, REMOVE ANY EGR TUBES OR SMOG PUMP TUBES, AND FINALLY UNBOLT IT FROM THE MOTOR, YOU MAY HAVE TO REMOVE ANY THING THAT WOULD BE A CLEARANCE PROBLEM, THAT WOULD KEEP YOU FROM GETTING THE MANIFOLD OUT FROM UNDER THE HOOD.
HERES THREE OPTIONS TO GO WITH AS FAR A REPLACING THEM...1. FIND A DECENT SET OFF A JUNK TRUCK IN THE JUNKYARD(cheapest option) 2. GET BRAND NEW MANIFOLDS(like you said 240.00)
3. HEADERS( i recommend theses, youll get more power) THIS INFO SHOULD HELP YOU
P.S. EXAUST MANIFOLDS ARE LEFT AND RIGHT, NOT REAR AND FRONT.
HERES THREE OPTIONS TO GO WITH AS FAR A REPLACING THEM...1. FIND A DECENT SET OFF A JUNK TRUCK IN THE JUNKYARD(cheapest option) 2. GET BRAND NEW MANIFOLDS(like you said 240.00)
3. HEADERS( i recommend theses, youll get more power) THIS INFO SHOULD HELP YOU
P.S. EXAUST MANIFOLDS ARE LEFT AND RIGHT, NOT REAR AND FRONT.
Post Fiend
Joined: Mar 2004
Posts: 24,418
Likes: 3
From: San Francisco, Ca.
You're lucky it's not an early 80's 4.9 Ca. emisions engine.
To change the intake manifold gasket, I was quoted 11-12 hours from the dealer. Yeah, Right.
That intake manifold gasket job only took me 10 hrs.
To change the intake manifold gasket, I was quoted 11-12 hours from the dealer. Yeah, Right.
That intake manifold gasket job only took me 10 hrs.
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Postmaster
Joined: Mar 2003
Posts: 4,038
Likes: 2
From: Spokane WA
first off, if its an early 90s truck, and not early 80s, your in the wrong forum 
BUT......
Im assuming based on the statement "front and back" that you do indeed have a 90s truck and have FI...... the fuel injected manifolds are not far off from what headers would be performance wise, based on what Ive been told.
IMO this thread needs to be moved to the inline forum, you'll get more specialized help there...
BUT......
Im assuming based on the statement "front and back" that you do indeed have a 90s truck and have FI...... the fuel injected manifolds are not far off from what headers would be performance wise, based on what Ive been told.
IMO this thread needs to be moved to the inline forum, you'll get more specialized help there...
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