Exhuast headers on 351m
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Exhuast headers on 351m
I have a 79 f-150 with a 351m in it and a 4 speed. I am looking at the dynomax headers in Jegs that are ceramic coated for 209.99.
The exhuast shop here wont install any exhuast without putting cats on. so I am gonna make one myself. This is a farm truck so I dont need a emission sticker or a cat. Ok here are the questions:
Will they fit without hitting anything?
Will I be able to mount purple horny header glass packs off of them without hitting any thing.
As soon as I get them mounted on hopefully the shop will just put tail pipes on from each glass pack way to the back out each side. ANY suggestions would be helpful!
1979 F-150 Custom 4x4 351M 4 speed
"When in Doubt GAS it"
The exhuast shop here wont install any exhuast without putting cats on. so I am gonna make one myself. This is a farm truck so I dont need a emission sticker or a cat. Ok here are the questions:
Will they fit without hitting anything?
Will I be able to mount purple horny header glass packs off of them without hitting any thing.
As soon as I get them mounted on hopefully the shop will just put tail pipes on from each glass pack way to the back out each side. ANY suggestions would be helpful!
1979 F-150 Custom 4x4 351M 4 speed
"When in Doubt GAS it"
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From: Virginia
Exhuast headers on 351m
I have heard someone else say that there local shop "wouldn't touch" a vehicle without the cats being on. Who do they think they are? The catalytic police or something? They can't take them off, or modify the vehicle themselves, but if you take them off, it's YOUR problem that they are missing, not the muffler shop's. I have done my own exhaust at times, and what can help is one of those carpenter's rules that fold up. You can hold it up under the the truck and form the rule into the shape you need to figure out roughly the dimensions. I have then transferred this to a large piece of card board where I draw out exactly what I want. Then I take it to the muffler shop and they bend the pipe to match the cardboard. It's worked so far, but be careful when you are planning, you have to think in three dimensions sometimes when snaking through cramped areas.
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Exhuast headers on 351m
I have the dynomax headers on my 79 with 400 and c6. The headers dont stick down far enough to simply bolt staight pipe or header mufflers to them. You need to have pipes bent to clear the crossmember. My local shop wanted $400 to make an exhaust for it after I convinced them that it never had nor needed cats. I said forget it. Hooker makes an exhaust designed to bolt to their headers and fit our trucks. I am going to see if their kit will also work with the dynomax headers.
The dynomax headers fit very well, better than I thought. The only thing I did'nt like was that I had to re-shape the dipstick tube. It was hard to get it bent right and still be able to insert the stick.
jake
The dynomax headers fit very well, better than I thought. The only thing I did'nt like was that I had to re-shape the dipstick tube. It was hard to get it bent right and still be able to insert the stick.
jake
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Joined: Jun 1999
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From: Greenville USA
Exhuast headers on 351m
I just had a set of dual exhaust made for my truck, it cost $320 including $100 for Dymomax Hemi Super Turbo mufflers and reducers.
Mufflers definitely won't bolt right onto the back of the collectors, the crossmember is in the way.
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
George
Mufflers definitely won't bolt right onto the back of the collectors, the crossmember is in the way.
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
George
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Exhuast headers on 351m
Thats what I was affraid of while looking at it but i thought that 12-18 inch packs might work, probly just gonna go with dynomax headers and true dual exhuast with 2 1/2 inch pipe, not sure on what i'm gonna use for mufflers yet.
Also if I put a edelbrock intake and 600cfm vac. sec. carb on it how many miles to the gallong would i loose? just a ball park figure is fine, the truck gets great miliage as is.
"When in Doubt GAS it"
Also if I put a edelbrock intake and 600cfm vac. sec. carb on it how many miles to the gallong would i loose? just a ball park figure is fine, the truck gets great miliage as is.
"When in Doubt GAS it"
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Exhuast headers on 351m
My fuel mileage did'nt change when I swithced from the Mototrcraft 2bbl to the edelbrock 600cfm 4bbl. I still got about 10 miles to the gallon on the highway. After installing the rest of the edelbrock power package and the headers I still seem to get 10 miles to the gallon, but now the truck has amazing power. The fact that I enjoy keeping my foot in it now probably has something to with the same fuel milage. I expected to get better fuel mileage, but I haven't driven it gently much since.
jake
jake
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Fleet Mechanic
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From: Toronto, Canada
Exhuast headers on 351m
[font size="1" color="#FF0000"]LAST EDITED ON 03-Nov-01 AT 06:23 PM (EST)[/font][p]KONKILR;
Did you use the Performer 3771 EGR manilfod and the 1405/6 carb and the cam/lifter package that they recommend?
I think that the number on the cam kit is 2172.
If not, what cam did you use?
Thanks
Matt
https://www.ford-trucks.com/dcforum/User_files/3ae0a7e34062b4ad.jpg
1978 F250 4x4 - 351M
Don't crush them, restore them!
Did you use the Performer 3771 EGR manilfod and the 1405/6 carb and the cam/lifter package that they recommend?
I think that the number on the cam kit is 2172.
If not, what cam did you use?
Thanks
Matt
https://www.ford-trucks.com/dcforum/User_files/3ae0a7e34062b4ad.jpg
1978 F250 4x4 - 351M
Don't crush them, restore them!
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Joined: Jun 1999
Posts: 265
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From: Greenville USA
Exhuast headers on 351m
[font size="1" color="#FF0000"]LAST EDITED ON 03-Nov-01 AT 06:56 PM (EST)[/font][p]I have the 1405 carb and the non-EGR manifold (my 78 is the last year of non-emissions on Ford trucks.) I have plenty of power until I hit about 4.5k rpm. I have no problem spinning my 35" tires through 2nd gear. Mileage is as high as 15 on the highway. I got 10 towing a 5000 lb load. I have a set of headers and a dual 2 1/2" exhaust flowing through the aforementioned Hemi Super Turbos.
I am pretty sure I have a stock cam, but since the PO installed most of the performance stuff, I'm not sure.
I want to install an Offenhauser Dual-Port 360 manifold (the only high-rise manifold I can find, the Edelbrock Performers and Weiand 8010 are both low-rise,) a 750 cfm carb, and a Comp Cams 32-308-4 cam , which seems to me to be the closest grind to what they used in the Hot Rod article.
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
George
I am pretty sure I have a stock cam, but since the PO installed most of the performance stuff, I'm not sure.
I want to install an Offenhauser Dual-Port 360 manifold (the only high-rise manifold I can find, the Edelbrock Performers and Weiand 8010 are both low-rise,) a 750 cfm carb, and a Comp Cams 32-308-4 cam , which seems to me to be the closest grind to what they used in the Hot Rod article.
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
George
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Fleet Mechanic
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From: Toronto, Canada
Exhuast headers on 351m
What are the benfits of the high rise?
Sounds good, where do I find Offenhauser's website?
https://www.ford-trucks.com/dcforum/User_files/3ae0a7e34062b4ad.jpg
1978 F250 4x4 - 351M
Don't crush them, restore them!
Sounds good, where do I find Offenhauser's website?
https://www.ford-trucks.com/dcforum/User_files/3ae0a7e34062b4ad.jpg
1978 F250 4x4 - 351M
Don't crush them, restore them!
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Exhuast headers on 351m
I have the EGR manifold with the EGR eliminator plate, the 1406 carb (electric choke) and the recommended cam w/lifters. I am not totally sure of my fuel mileage, I have not calculated it yet it seems to use the same amount of fuel to go to my usual places.
jake
jake
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Joined: Jun 1999
Posts: 265
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From: Greenville USA
Exhuast headers on 351m
[font size="1" color="#FF0000"]LAST EDITED ON 04-Nov-01 AT 01:20 AM (EST)[/font][p]An Edelbrock performer is a low-rise, and a Performer RPM is a high-rise (In Weiand, an Action-Plus is a low rise, a Stealth is a high-rise.) Basically the runners have more volume, giving more top-end performance. Unfortunatly Edelbrock makes no Performer RPM for the 400, and Weiand no Stealth.
Offenhauser has no web site I can find, only place I have seen their manifold is in the PAW catalog.
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
George
Offenhauser has no web site I can find, only place I have seen their manifold is in the PAW catalog.
fordmando
70 F-100 Ranger XLT 400 C6
78 F-150 4x4 400 4 on floor
George
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From: Virginia
Exhuast headers on 351m
I've read somewhere in here that a company makes adapters so you can run a 351c intake manifold which would give you more choices. Summit sells an x-celerator for 351c w/2bbl heads that is definitely a high rise.