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EFI Exhaust Manifold Conversion

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stark-in-the-wild
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EFI Exhaust Manifold Conversion

Post #1 by stark-in-the-wild » Fri Mar 08, 2019 12:03 pm

Hi all,

I am new to the Ford Six club. Just picked up a 1980 Ford F250 for $900 then drove it a thousand miles home. Its in rough condition. With that I had to replace the intake/exhaust manifold gasket and was reading everywhere that I might as well get an exhaust manifold from a newer truck with a Y Pipe. After reading that i purchased both in the hopes of giving the old truck a little more power and help it run smoother.

My question is the old intake manifold was bolted directly to the exhaust manifold with an inlet connecting the two. I have never seen this before and am wondering if with this common conversion one would just block that intake inlet as the newer manifolds don't have that air channel? Or does anyone have a link where this conversion is laid out? Just my last attempt at trying to get a right answer before I start doing things and seeing what happens haha Any help is appreciated!

Thanks!

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bubba22349
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Re: EFI Exhaust Manifold Conversion

Post #2 by bubba22349 » Fri Mar 08, 2019 2:42 pm

Yes the EFI exhaust manafolds are a very common conversion that's also usually done with the addition of a Clifford or Offy intake and a Autolite / Motocraft or Holley 2V or 4V Carb. Yes you could block off the lower section of the stock intake or just leave it open it won't mater as it isn't open inside and was designed to transfer heat to the intake. Good luck :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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THE FRENCHTOWN FLYER
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Re: EFI Exhaust Manifold Conversion

Post #3 by THE FRENCHTOWN FLYER » Fri Mar 08, 2019 2:55 pm

Where the original exhaust bolted to the intake - three long bolts hold them together - you do not have to do anything to block off the cavity in the intake. Just install the EFI exhaust manifolds leaving that passageway open. Some intake manifolds have a hole adjacent to the carb mounting surface (about the size of a penny) that is for the EGR. The carb spacer under the carb has a similar passageway. You can block that hole if you are not going to use the EGR system. I recommend keeping the EGR system intact. There is also a spacer that has that hole blocked off but it is relatively hard to find.

Check the Y-pipe inside where the two branches join. Often the fit-up and welding quality is hawrrible. You may have yo finish it up a little.
Last edited by THE FRENCHTOWN FLYER on Fri Mar 08, 2019 3:04 pm, edited 1 time in total.
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THE FRENCHTOWN FLYER
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Re: EFI Exhaust Manifold Conversion

Post #4 by THE FRENCHTOWN FLYER » Fri Mar 08, 2019 3:03 pm

A source of heated carb inlet air is needed to prevent carb icing in cold damp conditions. It would help to fashion some sort of heat stove on one of the exhaust manifolds.

Also if your carb had a hot air tube from the exhaust to choke housing you will need to fashion one. Use bendable copper tube wrapped around the exhaust with the appropriate fitting on the end. A fiberglass heat sock will improve the action of the choke. Good luck.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

stark-in-the-wild
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Re: EFI Exhaust Manifold Conversion

Post #5 by stark-in-the-wild » Sat Mar 09, 2019 1:09 pm

Awesome thanks guys! Really appreciate the help here as this is my first Ford Six post and my first time working on this engine. Anyone run the chevy rocker arms too while im at it? If so worth it?

pmuller9
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Re: EFI Exhaust Manifold Conversion

Post #6 by pmuller9 » Sat Mar 09, 2019 1:35 pm

stark-in-the-wild wrote: Anyone run the chevy rocker arms too while im at it? If so worth it?

Here is a Chevy Rocker comparison on the 240 six.
viewtopic.php?p=594508#p594508

BigBlue94
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Re: EFI Exhaust Manifold Conversion

Post #7 by BigBlue94 » Sat Mar 09, 2019 6:09 pm

AbandonedBronco and others have made up little heating plates that fill that opening in the intake. They plumb coolant through it from one of the heater hoses.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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old28racer
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Re: EFI Exhaust Manifold Conversion

Post #8 by old28racer » Sun Mar 10, 2019 4:22 pm

This picture is of the 300 street motor I am building. It is an early EFI block with a 240 68cc chamber head with larger SBC 1.84/1.60 valves. I have an Edelbrock DP intake with a Autolite 4V carb on it that I am going to sell so I can put on a Edelbrock C with a 2V adapter so I can run a Autolite 2150 2V carb. The picture shows the EFI exhaust manifolds bolted to the 240 head, every thing fits fine. This setup will work together with 240/300/300EFI head setup. As I am using a 240 alternator bracket I had to notch it a bit to clear the #1 runner on the EFI manifold.

I have a 2 1/2" dual exhaust system on my 1971 F250 300 4.9L truck. Currently it has 6 cylinder headers on it, but I don't like the look and will be installing the EFI exhaust manifolds later this year. Keep in mind that to change a OEM type starter the header must be dropped to make clearance. A dual exhaust system with the EFI exhaust manifold will make a good power improvement.
Image
Image
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Re: EFI Exhaust Manifold Conversion

Post #9 by 1986F150six » Mon Mar 11, 2019 10:52 am

THE FRENCHTOWN FLYER wrote: Some intake manifolds have a hole adjacent to the carb mounting surface (about the size of a penny) that is for the EGR. The carb spacer under the carb has a similar passageway. You can block that hole if you are not going to use the EGR system. I recommend keeping the EGR system intact. There is also a spacer that has that hole blocked off but it is relatively hard to find.


https://www.ebay.com/itm/1986-1987-FORD ... rk:35:pf:0

stark-in-the-wild
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Re: EFI Exhaust Manifold Conversion

Post #10 by stark-in-the-wild » Mon Mar 11, 2019 2:52 pm

pmuller9 wrote:
stark-in-the-wild wrote: Anyone run the chevy rocker arms too while im at it? If so worth it?

Here is a Chevy Rocker comparison on the 240 six.
viewtopic.php?p=594508#p594508


Awesome thank you so much! that is exactly what I was looking for.

stark-in-the-wild
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Re: EFI Exhaust Manifold Conversion

Post #11 by stark-in-the-wild » Mon Mar 11, 2019 2:53 pm

old28racer wrote:This picture is of the 300 street motor I am building. It is an early EFI block with a 240 68cc chamber head with larger SBC 1.84/1.60 valves. I have an Edelbrock DP intake with a Autolite 4V carb on it that I am going to sell so I can put on a Edelbrock C with a 2V adapter so I can run a Autolite 2150 2V carb. The picture shows the EFI exhaust manifolds bolted to the 240 head, every thing fits fine. This setup will work together with 240/300/300EFI head setup. As I am using a 240 alternator bracket I had to notch it a bit to clear the #1 runner on the EFI manifold.

I have a 2 1/2" dual exhaust system on my 1971 F250 300 4.9L truck. Currently it has 6 cylinder headers on it, but I don't like the look and will be installing the EFI exhaust manifolds later this year. Keep in mind that to change a OEM type starter the header must be dropped to make clearance. A dual exhaust system with the EFI exhaust manifold will make a good power improvement.
Image
Image


Perfect this helps a lot! and good to know about the alternator as Im sure ill have to do something similar

stark-in-the-wild
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Re: EFI Exhaust Manifold Conversion

Post #12 by stark-in-the-wild » Mon Mar 11, 2019 2:55 pm

1986F150six wrote:
THE FRENCHTOWN FLYER wrote: Some intake manifolds have a hole adjacent to the carb mounting surface (about the size of a penny) that is for the EGR. The carb spacer under the carb has a similar passageway. You can block that hole if you are not going to use the EGR system. I recommend keeping the EGR system intact. There is also a spacer that has that hole blocked off but it is relatively hard to find.


https://www.ebay.com/itm/1986-1987-FORD ... rk:35:pf:0


Just curious as I have never run into an EGR system before. Why do you recommend keeping that intact (im not sure what it does)? does this bit help with Smog of any kind? and if i get a new carb do you think this would be needed still?

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MechRick
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Re: EFI Exhaust Manifold Conversion

Post #13 by MechRick » Mon Mar 11, 2019 3:13 pm

The EGR is to reduce NOX. It can also help fuel economy by reducing pumping losses. More throttle (to maintain speed when EGR is flowing) equals less manifold vacuum equals a reduction in pumping losses.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
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Bronco II with a 2.3L swap http://fordsix.com/forum/viewtopic.php?f=13&t=72863
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Shorty
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Re: EFI Exhaust Manifold Conversion

Post #14 by Shorty » Mon Mar 11, 2019 6:42 pm

when i put the efi manifolds on mine I put a heat shield between the back of the alternator and the manifold. Can't remember if this was a stock piece but it wouldn't be hard to make and would help extend the life of the alternator. Mine has a big body alternator that has been wired to be able to weld, similar to the premier brand welder alternators and it gets hot on its own when it is used to weld but it will burn 1/8 7018 at about 2200 engine rpm.
85 F150 on 78 bronco frame C6 np205 welded dana44 front, trussed posi nine inch rear. EFI exhaust manifolds into one 2 1/2" rolls on 35x12.5x15 Maxxis Trepador.

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old28racer
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Re: EFI Exhaust Manifold Conversion

Post #15 by old28racer » Fri Mar 15, 2019 3:03 pm

stark-in-the-wild --- If your 80 F250 has a 300 4.9L alternator bracket you may not have to notch it to clear the EFI Exhaust Manifold. Mine was a 240 bracket.
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