Exhaust manifold question
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Junior User
Joined: Sep 2002
Posts: 57
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From: Aurora USA
Exhaust manifold question
Got a question here for you experts...will a newer exhaust manifold fit onto an older FE? Reason I ask is I was at the local Pull and Save today and found a truck around '74-'75 with an FE in it, with the manifolds still on it. My poor old '68 has a cracked drivers side log, so I went ahead and pulled one off this newer truck. Sure hope it fits, but if not I am only out $14 and some skin. Couldn't say no to it at that price! I still can't believe I got it off without any WD or any other lubricant! One other question...the passenger side had the "heat shield/exhaust warmer" sheetmetal on it...mine doesn't have that. Would it be worth the skin to go back and get it tomorrow?? Oh yea...any advice or tips on installing exhaust mainfolds would be really appreciated! Thanks guys!
Chad Burns
Aurora, Co.
1968 F-250 390
Chad Burns
Aurora, Co.
1968 F-250 390
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
Exhaust manifold question
Go get the other manifold. If the bolts came out without any problem, check the heads they may be rebuilt. I found a set like that a while back. The right manifold on trucks is different than on cars, the left is the same. Those heat stoves are hard to find in good condition.
William in Atlanta
William in Atlanta
Senior User
Joined: Aug 2002
Posts: 101
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From: Bowling Green, Ohio
Exhaust manifold question
Chad,
I use high-temp "never sieze" goop on the thread of all my exhaust manifold bolts. It comes in a (approx.) 6 oz. bottle, with a brush, and it looks like grease with little copper, metal flakes mixed in. This anti-sieze stuff will help prevent your manifold bolts from rusting in place (and snapping the next time someone removes them).
Seems as though you snow-pack states have much nicer older vehicles. I was in CO a year ago and couldn't believe the great condition of the older cars and trucks I saw. The automoblile manufacturers have some kind of conspiracy here (in Ohio) to destroy all metal with road salt. Finding a good heat-stove is rare (like finding an uncracked windshield in CO).
Ohio Bill
I use high-temp "never sieze" goop on the thread of all my exhaust manifold bolts. It comes in a (approx.) 6 oz. bottle, with a brush, and it looks like grease with little copper, metal flakes mixed in. This anti-sieze stuff will help prevent your manifold bolts from rusting in place (and snapping the next time someone removes them).
Seems as though you snow-pack states have much nicer older vehicles. I was in CO a year ago and couldn't believe the great condition of the older cars and trucks I saw. The automoblile manufacturers have some kind of conspiracy here (in Ohio) to destroy all metal with road salt. Finding a good heat-stove is rare (like finding an uncracked windshield in CO).
Ohio Bill
Elder User
Joined: Sep 2002
Posts: 622
Likes: 0
From: Urbandale, Iowa
Exhaust manifold question
Hey guys,
What is the heat stove? I wonder if a) I have one on my 390 and b) if not, might that be why it's a tad cold-blooded?
The left side (driver) manifold on my truck is leaking, going to fix that with a new heat-shield/gasket. but I wonder if I'm missing the heat stove?
Thanks,
Pat
What is the heat stove? I wonder if a) I have one on my 390 and b) if not, might that be why it's a tad cold-blooded?
The left side (driver) manifold on my truck is leaking, going to fix that with a new heat-shield/gasket. but I wonder if I'm missing the heat stove?
Thanks,
Pat
Elder User
Joined: Sep 2002
Posts: 622
Likes: 0
From: Urbandale, Iowa
Exhaust manifold question
Yep, I'm missing mine. Now here's a question. Why is it important to have? Isn't it better to get cooler (denser) air to the carb?
Thanks.
Thanks.
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Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
Exhaust manifold question
Yes it is to a point but it can bite you in some cases.
When the engine is cold, warmer air helps keep the air/fuel mixture in suspension instead of falling out as it turns inside the manifold, especially when you give it some gas and the manifold vacuum drops. That's why a carb. backfires when you goose it cold, it's a lean-out condition.
Also, when it is very cold and damp outside, the moisture in the mixture can freeze inside the carb. and actually block off the throttle bore. Warmer air helps keep the moisture above the freezing point when it passes through the throttle plate. Vaporized fuel naturally lowers the mixture temperature but it's the pressure drop that can lower the temperature below freezing. Has something to do with PV=NRT
Barry
When the engine is cold, warmer air helps keep the air/fuel mixture in suspension instead of falling out as it turns inside the manifold, especially when you give it some gas and the manifold vacuum drops. That's why a carb. backfires when you goose it cold, it's a lean-out condition.
Also, when it is very cold and damp outside, the moisture in the mixture can freeze inside the carb. and actually block off the throttle bore. Warmer air helps keep the moisture above the freezing point when it passes through the throttle plate. Vaporized fuel naturally lowers the mixture temperature but it's the pressure drop that can lower the temperature below freezing. Has something to do with PV=NRT
Barry
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Michael S. Palmer
Senior User
Joined: Oct 2002
Posts: 230
Likes: 1
Exhaust manifold question
I bought a '69 Merc Monterey with a 390 that had a major leak from the left manifold. Not knowing a damn thing about FE's at the time (about 6 weeks ago, been reading a LOT since) I just replaced the gasket which was totally blown to pieces. Just as I tighten down the LAST bolt my ever helpful chevy neighbor wanders over & says "yanno those 390's have a bad habit of warping the manifolds". He was right, new gasket didn't make any damnn difference at all. 5 minutes at the machine shop with the manifold on the big belt sander fixed it (was warped by about 3/32nd) & lightend my wallet by $28 (eek!).
I need to buy a bigger belt sander....
I need to buy a bigger belt sander....
Elder User
Joined: Sep 2002
Posts: 622
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From: Urbandale, Iowa
Exhaust manifold question
[updated:LAST EDITED ON 04-Dec-02 AT 00:05 AM (EST)]Grrreaaaaat. I've got a leaking left manifold that has a bolt head already missing (see the "exhaust issues" thread). The news just keeps getting better and better.
Did you have problems getting the bolts out?
Did you have problems getting the bolts out?
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