Ford HD exhaust
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Elder User
Joined: Sep 2008
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From: DeKalb, Ill.
Ford HD exhaust
I was reading about exhaust manifolds used on
300 equipped Ford dump trucks in the '60s and '70s.
Supposedly, they have better flow than a header or EFI manifolds.
I have a line on one of these manifolds, but I haven't seen it yet.
I'm just wondering if anyone has used this manifold.
Does it fit in the engine compartment of a light duty truck
(considering fender well, firewall, and frame)?
This just seemed like a cool modification to me.
The coolest thing is that it's a Ford part.
Just wondering,
Murph.
300 equipped Ford dump trucks in the '60s and '70s.
Supposedly, they have better flow than a header or EFI manifolds.
I have a line on one of these manifolds, but I haven't seen it yet.
I'm just wondering if anyone has used this manifold.
Does it fit in the engine compartment of a light duty truck
(considering fender well, firewall, and frame)?
This just seemed like a cool modification to me.
The coolest thing is that it's a Ford part.
Just wondering,
Murph.
FTE Legend
Joined: May 2008
Posts: 56,542
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From: In my own world
we have 1 on an old cube van out back. really isn't a whole lot different, it's a little wider and thicker, has a lot bigger down pipe, carb has a governer on it. I would have probably gone with the efi manifolds if I didd'nt use headers on my truck
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Elder User
Joined: Sep 2008
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From: DeKalb, Ill.
How does the one you have mate with the intake manifold?
Does it look like it would work in a pick-up?
This manifold is about a 2 hour drive from me.
It's on an old grain truck that has been sitting for a long time.
If I make the drive and pull it... it's mine, that's the only price.
It might not be worth it, I'm just hoping someone will chime in
who has already used this manifold.
I want to know if it will fit before I consider driving down to yank it.
We'll see, if no one has any input, I might be the guinea pig for us all.
Murph.
FTE Legend
Joined: May 2008
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From: In my own world
looks like the pick up manifold will bolt up, not really sure, diddnt take off the cube truck, inside 2 bolts by block to manifold to intake measure 2 3/8 just like my 86 300. it's a single bbl carb,intake manifold might work too. mabe it is larger inside too. I would probably grab whole thing if free, and check it out
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Joined: Jul 2004
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From: Northern Virginia, USA
I really wanted to use this manifold on my truck instead of the EFI manifolds, but I couldn't find one at the time. Now they're on eBay for $199 new (I paid $65 for my used EFI manifolds including shipping). More expensive than headers or EFI, but if it'll bolt up to a regular manifold (Offy, etc.) and if it flows well, then it's all the fun and none of the mess.
Which begs the question: why design EFI manifolds, if the HD manifold would have worked fine? Are the EFI manifolds easier/cheaper to make?
From these pictures, it looks like there's no heat riser valve, and the carb mount is in the same place. What I can't tell is if the regular manifold has the carb mounted higher or not (different photo perspectives), and if the heat riser bolt pattern is different or not.
Light duty manifold:
EXHAUST MANIFOLD 65-83 FORD TRUCK 300 3.9L 4.9L NEW :eBay Motors (item 230301923521 end time Jun-16-09 07:59:45 PDT)
Heavy duty manifold:
4.9 300 FORD heavy duty NEW EXHAUST MANIFOLD:eBay Motors (item 270389112498 end time Jun-10-09 10:31:34 PDT)
Which begs the question: why design EFI manifolds, if the HD manifold would have worked fine? Are the EFI manifolds easier/cheaper to make?
From these pictures, it looks like there's no heat riser valve, and the carb mount is in the same place. What I can't tell is if the regular manifold has the carb mounted higher or not (different photo perspectives), and if the heat riser bolt pattern is different or not.
Light duty manifold:
EXHAUST MANIFOLD 65-83 FORD TRUCK 300 3.9L 4.9L NEW :eBay Motors (item 230301923521 end time Jun-16-09 07:59:45 PDT)
Heavy duty manifold:
4.9 300 FORD heavy duty NEW EXHAUST MANIFOLD:eBay Motors (item 270389112498 end time Jun-10-09 10:31:34 PDT)
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Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
There was a big discussion on this not too long ago over on Fordsix.com. Here's the link:
Fordsix Performance • View topic - 300 HD heavy duty exhaust manifold
Has pics on fitment and stuff.
As for clearance, they're the same size as the stock manifold, so they fit just fine. They just won't mate up with the stock exhaust so you'll have to have a new exhaust.
They also don't bolt up to the stock intake.
Stock exhaust. 2" outlet. 3.14 square inch outlet.
EFI Manifolds: Two 1.75" outlets. 4.8 square inch outlet
HD Manifold: 2.5" outlet. 4.9 square inch outlet.
It isn't MUCH of a difference over the EFI manifolds, but it's more. However, there are two EFI manifolds, so the engine is consistently firing into a manifold that is empty, which creates a small vacuum, which helps PULL exhaust out of the engine much like a header.
They're definitely cool, and if you have access to one, go for it. Either way, both the EFI manifolds and the HD manifold negate the heat riser and don't bolt up to the stock intake, so it's six of one, half a dozen of the other.
Fordsix Performance • View topic - 300 HD heavy duty exhaust manifold
Has pics on fitment and stuff.
As for clearance, they're the same size as the stock manifold, so they fit just fine. They just won't mate up with the stock exhaust so you'll have to have a new exhaust.
They also don't bolt up to the stock intake.
Stock exhaust. 2" outlet. 3.14 square inch outlet.
EFI Manifolds: Two 1.75" outlets. 4.8 square inch outlet
HD Manifold: 2.5" outlet. 4.9 square inch outlet.
It isn't MUCH of a difference over the EFI manifolds, but it's more. However, there are two EFI manifolds, so the engine is consistently firing into a manifold that is empty, which creates a small vacuum, which helps PULL exhaust out of the engine much like a header.
They're definitely cool, and if you have access to one, go for it. Either way, both the EFI manifolds and the HD manifold negate the heat riser and don't bolt up to the stock intake, so it's six of one, half a dozen of the other.
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Postmaster
Joined: Dec 2006
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From: Spokane, WA
Like was said, if you can pull the intake and exhaust, go for it. Other wise I don't see that the HD exhaust by itself is significant especially in view of what one can get with the EFI exhaust...unless one is planning on a turbo. The HD is just begging for that.
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From: Boise, Idaho
Thread Starter
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Elder User
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From: DeKalb, Ill.
Thanks to everyone for the replies.
Turns out things won't work out so easily.
The intake on the truck was robbed years ago,
I didn't know I might need it, but it's not there.
I had the guy examine the manifold, turns out it's cracked.
For now, my plans are stalled.
I might not pursue until I find a complete intake/exhaust system.
I hope this thread keeps going.
There's a lot of good stuff here.
Murph.
Turns out things won't work out so easily.
The intake on the truck was robbed years ago,
I didn't know I might need it, but it's not there.
I had the guy examine the manifold, turns out it's cracked.
For now, my plans are stalled.
I might not pursue until I find a complete intake/exhaust system.
I hope this thread keeps going.
There's a lot of good stuff here.
Murph.
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
You would have been fine without the intake, but the cracked exhaust is definitely something that's not worth messing with. How badly was it cracked though? Something that could be patched up?
It would probably be easier to go the EFI manifold route, easy to find, inexpensive used, and just takes a little grinding to make them fit with the stock intake.
It would probably be easier to go the EFI manifold route, easy to find, inexpensive used, and just takes a little grinding to make them fit with the stock intake.
Post Fiend
Joined: Jan 2007
Posts: 7,021
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From: Almost Heaven
You would have been fine without the intake, but the cracked exhaust is definitely something that's not worth messing with. How badly was it cracked though? Something that could be patched up?
It would probably be easier to go the EFI manifold route, easy to find, inexpensive used, and just takes a little grinding to make them fit with the stock intake.
It would probably be easier to go the EFI manifold route, easy to find, inexpensive used, and just takes a little grinding to make them fit with the stock intake.
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Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
It's not a lot. On the carb'd head, there are 13 bolt holes to hold the intake/exhaust on. On the EFI, there are 16. The 3 extra bolt holes were there to speed up the assembly line process at the factory. The carb intake/exhaust is bolted together, so there's 1 piece to put on the engine. The EFI is multiple pieces, with two exhaust manifolds and the intake. So they put some extra studs in so that you could "hang" the EFI manfolds from the engine when putting them on.
Since the carb doesn't have these bolt holes and the intake wasn't designed for them, one or two of the hanger bolt holes binds with the stock intake. I can't remember if I had to remove 1 or 2 of them on mine. Just some simple grinding until it's out of the way and no harm done. There was also a metal lump (extra heat dissipation?) that hit the intake as well and needed to be ground down. I'm sure if I had started with the 4bbl intake, I would have had to grind a lot less, since it has a little more clearance.
It took me about 30 minutes to an hour to grind it all, but anyone else that has more than a 20 year old 1/5hp grinder could probably do it in 5 - 10 minutes.
Since the carb doesn't have these bolt holes and the intake wasn't designed for them, one or two of the hanger bolt holes binds with the stock intake. I can't remember if I had to remove 1 or 2 of them on mine. Just some simple grinding until it's out of the way and no harm done. There was also a metal lump (extra heat dissipation?) that hit the intake as well and needed to be ground down. I'm sure if I had started with the 4bbl intake, I would have had to grind a lot less, since it has a little more clearance.
It took me about 30 minutes to an hour to grind it all, but anyone else that has more than a 20 year old 1/5hp grinder could probably do it in 5 - 10 minutes.
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
It's not a lot. On the carb'd head, there are 13 bolt holes to hold the intake/exhaust on. On the EFI, there are 16. The 3 extra bolt holes were there to speed up the assembly line process at the factory. The carb intake/exhaust is bolted together, so there's 1 piece to put on the engine. The EFI is multiple pieces, with two exhaust manifolds and the intake. So they put some extra studs in so that you could "hang" the EFI manfolds from the engine when putting them on.
Since the carb doesn't have these bolt holes and the intake wasn't designed for them, one or two of the hanger bolt holes binds with the stock intake. I can't remember if I had to remove 1 or 2 of them on mine. Just some simple grinding until it's out of the way and no harm done. There was also a metal lump (extra heat dissipation?) that hit the intake as well and needed to be ground down. I'm sure if I had started with the 4bbl intake, I would have had to grind a lot less, since it has a little more clearance.
It took me about 30 minutes to an hour to grind it all, but anyone else that has more than a 20 year old 1/5hp grinder could probably do it in 5 - 10 minutes.
Since the carb doesn't have these bolt holes and the intake wasn't designed for them, one or two of the hanger bolt holes binds with the stock intake. I can't remember if I had to remove 1 or 2 of them on mine. Just some simple grinding until it's out of the way and no harm done. There was also a metal lump (extra heat dissipation?) that hit the intake as well and needed to be ground down. I'm sure if I had started with the 4bbl intake, I would have had to grind a lot less, since it has a little more clearance.
It took me about 30 minutes to an hour to grind it all, but anyone else that has more than a 20 year old 1/5hp grinder could probably do it in 5 - 10 minutes.
Thanks AB. And you have room to do this in the engine bay? Do you have to lift the motor or anything? Forgive me if this is a stupid question but I can't picture it very well. Keep in mind I have a lot of electrical crap in my bay and can't get to my manifolds. I know it would be easier on a carb'd. How did you do it? Did you have to lift your motor?