351M Emissions
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Joined: Mar 2001
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From: Maryland
351M Emissions
Well I beleive I know the answer but need input. I have just rebuilt a 351M. Did the right things. Configuration is the following:
Bored 30 over
TRW Forged pistons (increase compression ratio)
Holly 650
Performer 400 intake
272 Cam
New timing gear set
Headers
high flow cat's
Flowmater mufflers.
MSD 6a
MSD Coil
This is being installed in place of my 4.9l, see my gallery.
Here is my question, I live in Maryland and we must pass tthe emmision test. The orginal 4.9L was rebuilt by me an passed with no problems. Now that I am going to put the 351m in I have a slight problem. The orginal configuration had a EGR Valve and an air pump. The performer intake has no provisions for the EGR (I have the version 400 that does not support EGR) nor does the headers have a port for the air pump. Maryland does not do an inspection for missing stuff. Do you guys think I should chance an emission testing in this configuration or purchase the performance 400 with EGR. What will I do with the AIR pump. I have a brand new one.
Bored 30 over
TRW Forged pistons (increase compression ratio)
Holly 650
Performer 400 intake
272 Cam
New timing gear set
Headers
high flow cat's
Flowmater mufflers.
MSD 6a
MSD Coil
This is being installed in place of my 4.9l, see my gallery.
Here is my question, I live in Maryland and we must pass tthe emmision test. The orginal 4.9L was rebuilt by me an passed with no problems. Now that I am going to put the 351m in I have a slight problem. The orginal configuration had a EGR Valve and an air pump. The performer intake has no provisions for the EGR (I have the version 400 that does not support EGR) nor does the headers have a port for the air pump. Maryland does not do an inspection for missing stuff. Do you guys think I should chance an emission testing in this configuration or purchase the performance 400 with EGR. What will I do with the AIR pump. I have a brand new one.
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351M Emissions
[updated:LAST EDITED ON 07-Mar-02 AT 11:02 AM (EST)]Hi DSC. Since you do not have to worry about a visual inspection, I would leave the EGR and AIR off. The 351M is a relatively "clean" engine to start with, and I think you will not have any trouble at all passing. Especially with the high-flow cats, and the MSD ignition.
Before testing, turn the idle mixture screws in about 1/2 turn (or whatever the engine will stand without dying), and pour a bottle of rubbing alcohol into an almost empty tank. Just a little insurance........Good luck!
Before testing, turn the idle mixture screws in about 1/2 turn (or whatever the engine will stand without dying), and pour a bottle of rubbing alcohol into an almost empty tank. Just a little insurance........Good luck!
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Joined: Sep 2001
Posts: 210
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From: Lincoln, Rhode Island
351M Emissions
dsc,
I would give the test a try since you have cats on it, but the smog pump does two things, one main thing is that it just blows air down the exhaust system and that is it, it has no internal effect on the motor or carb or anything! It does this for two reasons by introducing air at the manifolds it helps lower some of the emmisions gas because the temps are high enough cause chemical reactions and it leans out the exhaust mixture before it gets to the cat, this prevents cat melt down due to too rich a fuel mixture. All you need is the pump and the bypass diverter valve and the performer EGR manifold. there is a threaded fitting on the manifold that the valve attaches to. Your heads should already have the ports so you don't have to worry about your headers just leave them alone as they are. I might have a picture of how it is setup I will have to look. I put it on my truck and there was no difference I did not have to touch a thing, retune the carb nothing. And I know it lowers my emmisions and makes sure that I will not be constantly replacing cats.
400m
I would give the test a try since you have cats on it, but the smog pump does two things, one main thing is that it just blows air down the exhaust system and that is it, it has no internal effect on the motor or carb or anything! It does this for two reasons by introducing air at the manifolds it helps lower some of the emmisions gas because the temps are high enough cause chemical reactions and it leans out the exhaust mixture before it gets to the cat, this prevents cat melt down due to too rich a fuel mixture. All you need is the pump and the bypass diverter valve and the performer EGR manifold. there is a threaded fitting on the manifold that the valve attaches to. Your heads should already have the ports so you don't have to worry about your headers just leave them alone as they are. I might have a picture of how it is setup I will have to look. I put it on my truck and there was no difference I did not have to touch a thing, retune the carb nothing. And I know it lowers my emmisions and makes sure that I will not be constantly replacing cats.
400m
Senior User
Joined: Sep 2001
Posts: 210
Likes: 2
From: Lincoln, Rhode Island
351M Emissions
Well Art it is really your call. You can try to pass emmissions test with your current setup, will you pass? I think so, if everything is dialed in tight. You can run the truck as is and see if you have any cat problems, If you do then you can put on new cats and change the manifold, you may not have any problems but you will need to pay more attention to all of your adjustments, or just change the manifold and add the emmissions equipment. You can usually find these manifolds on ebay for cheap. It really is just your choice unless you fail the emmissions test really.
400m
400m
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From: (near) Denver USA
351M Emissions
Art,
The Performer non-EGR manifold has provisions for the Thermactor AIR system. There is a big (3/4" or so) port for the AIR system on the right front of the manifold (to the left if your facing the engine), in the same place as the stock manifold. The manifold's AIR passage connects to the AIR passages on the front of each cylinder head.
I recommend that you set up the Thermactor AIR system. There is almost no performance cost (less than 1hp to drive the pump) and it will work very well with your cats to hide a multitude of sins and clean up the tailpipe emissions.
The Performer non-EGR manifold has provisions for the Thermactor AIR system. There is a big (3/4" or so) port for the AIR system on the right front of the manifold (to the left if your facing the engine), in the same place as the stock manifold. The manifold's AIR passage connects to the AIR passages on the front of each cylinder head.
I recommend that you set up the Thermactor AIR system. There is almost no performance cost (less than 1hp to drive the pump) and it will work very well with your cats to hide a multitude of sins and clean up the tailpipe emissions.
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From: Maryland
351M Emissions
Thanks Bubbaf250. I have a new air pump. I guess that will the best way to go. Do you know if a C6 transmission off a 460 will bolt to my 351m. It is going in the truck in my gallery. I am removing the 3 speed overdrive that was rebuit last year. I know there will be a little work envolved but my left foot is tired. Thanks Art
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Posting Guru
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From: PacNW
351M Emissions
>Thanks Bubbaf250. I have a new air pump. I guess that will
>the best way to go. Do you know if a C6 transmission off a
>460 will bolt to my 351m. It is going in the truck in my
>gallery. I am removing the 3 speed overdrive that was rebuit
>last year. I know there will be a little work envolved but
>my left foot is tired. Thanks Art
Bellhousing bolt pattern is the same. It should bolt right up. I believe you'll need to remove the pilot bearing from the crank.
>the best way to go. Do you know if a C6 transmission off a
>460 will bolt to my 351m. It is going in the truck in my
>gallery. I am removing the 3 speed overdrive that was rebuit
>last year. I know there will be a little work envolved but
>my left foot is tired. Thanks Art
Bellhousing bolt pattern is the same. It should bolt right up. I believe you'll need to remove the pilot bearing from the crank.
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Posting Guru
Joined: Aug 2000
Posts: 1,127
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From: (near) Denver USA
351M Emissions
Art,
Bill B already answered your tranny question.
OK, this is off-topic for this forum, but I just wanted to say that is one sweet-lookin' truck. I am partial to the '80-'86 body style myself, and I like how you updated the exterior mirrors with the later model pieces. Nice touch.
Now don't forget those Motorsports aluminum valve covers for the 351M, and a chrome SVO air cleaner cover if you can find one.
Bill B already answered your tranny question.
OK, this is off-topic for this forum, but I just wanted to say that is one sweet-lookin' truck. I am partial to the '80-'86 body style myself, and I like how you updated the exterior mirrors with the later model pieces. Nice touch.
Now don't forget those Motorsports aluminum valve covers for the 351M, and a chrome SVO air cleaner cover if you can find one.
Thread Starter
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Senior User
Joined: Mar 2001
Posts: 296
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From: Maryland
351M Emissions
Bubba. The mirrors are off a 1994 f150, I removed the old big truck mirrows welded the holes and painted. There were two holes left right below the vent window. I used the exsisting rear hole. Had to cut a 1 inch by 1 inch hole in front of the screw and had to drill a new front hole. If you can get you hands on a pair of these all you have to do is use the rubber gasket, it will all fall into place.
Thanks for the comments on the truck. I spent a lot of time 1 year. Told my self not to hurry and did it right. I sold the 4.9l for $850. on ebay and got the new eng for free. The rework of the eng boring etc. will run about $700. The 4.9l runs great but not enough power for me.
I have leaned alot from this board. It has save me alot of$$$. Thanks again everyone. I am sure I will a million more questions. Art
Thanks for the comments on the truck. I spent a lot of time 1 year. Told my self not to hurry and did it right. I sold the 4.9l for $850. on ebay and got the new eng for free. The rework of the eng boring etc. will run about $700. The 4.9l runs great but not enough power for me.
I have leaned alot from this board. It has save me alot of$$$. Thanks again everyone. I am sure I will a million more questions. Art
