351 m problems
New User
Joined: Jan 2008
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I believe it would be better to find a 400 and do that up.
Most of that fule economy is probably going to the overload on the engine when pulling.
The 400 would do much better.
For the first 5 years of its life, my 400 got me 18 mpg city & 22 hwy.
That's IMP gallons.
Most of that fule economy is probably going to the overload on the engine when pulling.
The 400 would do much better.
For the first 5 years of its life, my 400 got me 18 mpg city & 22 hwy.
That's IMP gallons.
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Freshman User
Joined: Dec 2005
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Ill look into a 400 the only thing is with keeping the 351 m is that it has not been tore apart since 1978 when it was built. will the exaust on the 400 come out the same as the 351 m? I removed the new dual exaust when I put in the 302, so I would have it all later if I wanted to go back to the m block. the parts for these engine are expensive, do you know where I can get a rebuild kit? I'm in a small town with one parts store if that would tell you anything. I just bought a 87 4x4, and the 78 is now a complete restore project for my boys. It will never leave the family . the 78 is a very fun to drive, and its the end of the good built hard working trucks. thanks mi1ion!
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Freshman User
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tjc did you go with a 4 speed auto? the radator will also have to be changed also for cooling lines, was there anything hard that you ran into in this swap. my engine is a 300 6 they tell me same as 302 or 351w transmission. I'll start buying parts as soon as I know what is needes so everything will be here with no running out for something I forgot thanks
i ain't rite
Joined: Mar 2005
Posts: 65,426
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From: Marlboro Mental Hospital.
no, i went with the C6, because my diesel does not have a computer, i did not feel like messing with trans electronics, and i do not need the od, i have the crown vic for a highway cruiser, and one of the drivers has a new dodge hemi 4 door 4X4 250, and likes to drive, so whenever something needs to be picked up over 100 miles away, he drives, and i relax in the back seat.
i might be old, but i ain't stoopid
i might be old, but i ain't stoopid
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Joined: Jan 2008
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Go to this page and click the blue link that interests you.
http://home.earthlink.net/~bubbaf250/perf/perf01.html
http://home.earthlink.net/~bubbaf250/perf/perf01.html
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i ain't rite
Joined: Mar 2005
Posts: 65,426
Likes: 5,508
From: Marlboro Mental Hospital.
the best way to get an idea of how it will run with a C6 is to drive it around in 4th gear. 4th gear in the 5 speed trans is direct drive, like high gear in the C6. that is how i determined i could live with the C6 in my diesel. i drove a friends 5 speed diesel for a day, and never used overdrive.
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1973 - 1979 F-100 & Larger F-Series Trucks
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Apr 10, 2006 10:19 AM