help please 351m 400
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New User
Joined: Jul 2020
Posts: 18
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From: Pa. USA
help please 351m 400
i blew the engine on my 79 350 dump last week. after removing one head i found damage between to cylinders on the block. luckily i had already found a good used engine. i decided to freshen it up. but i am very confused as to what i have. i have searched threads and still confused i read one answer it says one thing, i go to the next and it totally contradicts it. this is what i have block number d7te a3b. pistons are 4.0 inches mains are 3 inches rod journals 2.3. i have read that this could be a 400 being as the mains are 3.0 but ????
also on the piston skirt 351m is marked on it
this engine is going to go into my 79 although i believe it to be a 77...
any help would be appreciated....I AM SO CONFUSED....
oh and it dosent matter what the m stands for.....
also on the piston skirt 351m is marked on it
this engine is going to go into my 79 although i believe it to be a 77...
any help would be appreciated....I AM SO CONFUSED....
oh and it dosent matter what the m stands for.....
Butt-Head
Joined: Apr 2004
Posts: 9,437
Likes: 2,925
From: Reed Point, MT
It's not a 400 if it has "351M" pistons in it; the pistons would hit the head.
The main journals for both are 3". The only differnce between the two engines are the crankshaft and pistons.
They do have a lot in common though, especially that they are both boat anchors in stock form. Make sure to put rod and main bearings in it before you install it since they're almost "maintenance items" every 50-60K miles and you don't want to pull the engine again (you said f350 dumper so I assume 2wd).
The main journals for both are 3". The only differnce between the two engines are the crankshaft and pistons.
They do have a lot in common though, especially that they are both boat anchors in stock form. Make sure to put rod and main bearings in it before you install it since they're almost "maintenance items" every 50-60K miles and you don't want to pull the engine again (you said f350 dumper so I assume 2wd).
Grumpy goat
Joined: May 2017
Posts: 3,058
Likes: 594
It's not a 400 if it has "351M" pistons in it; the pistons would hit the head.
The main journals for both are 3". The only differnce between the two engines are the crankshaft and pistons.
They do have a lot in common though, especially that they are both boat anchors in stock form. Make sure to put rod and main bearings in it before you install it since they're almost "maintenance items" every 50-60K miles and you don't want to pull the engine again (you said f350 dumper so I assume 2wd).
The main journals for both are 3". The only differnce between the two engines are the crankshaft and pistons.
They do have a lot in common though, especially that they are both boat anchors in stock form. Make sure to put rod and main bearings in it before you install it since they're almost "maintenance items" every 50-60K miles and you don't want to pull the engine again (you said f350 dumper so I assume 2wd).
Thread Starter
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New User
Joined: Jul 2020
Posts: 18
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From: Pa. USA
Thanks for the replies guys, if i understand correctly the difference is the crank, rods and pistons? So if i were to use the crank and pistons from my old engine i wouldhave a 400?
and yes it is 2wd
i assume that the bell housing is the same for both?
and finally if one thinks it is a boat anchor, if i would change engines what would be recommended that would work with the same trans, dont want to change that as the dump works fine with the pto as is
and yes it is 2wd
i assume that the bell housing is the same for both?
and finally if one thinks it is a boat anchor, if i would change engines what would be recommended that would work with the same trans, dont want to change that as the dump works fine with the pto as is
Butt-Head
Joined: Apr 2004
Posts: 9,437
Likes: 2,925
From: Reed Point, MT
How many have YOU owned and repaired with 50-100K miles of good maintenance and weren't abused that needed crankshaft bearings? I've done a few. One was good enough for a standard bearing "roll-in" while the others had to have the crank machined. I still have one that travels around the property that hasn't had more than 3-5 psi of oil pressure for better than a decade....it'll either be next on the list or just get junked entirely. That's not to say ALL 335 series engines suffer from this problem but I know I'm not the only one who has had to do this on an otherwise healthy, well-maintained engine.
Notice I said "stock". Modifications MAY negate a few of the shortcomings....but without some money and time, they all stay "stock-ish" and therefore turds. It's often time or money that keeps people from changing to a different engine family or modifying the thing to run more "CID appropriate" so it's best to leave stuff alone.
To the OP, yes, use your 400 crank and buy 400 pistons of your choice before reassembling. Both are internally balanced so the flywheel/harmonic dampener can be reused if not damaged/bad.
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New User
Joined: Jul 2020
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From: Pa. USA
Ok from the advice i have received, (thanks) i have a 351m. I can use use the 400 crank and purchase new 400 pistons as wel as new rod and main bearings. Any other suggestions? Maybe an intake and carb, mild cam? This is a go to the gravel yard, haul a few boards type of truck.
i dont want to spend a lot but i am planning on keeping her.
i dont want to spend a lot but i am planning on keeping her.
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Thread Starter
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New User
Joined: Jul 2020
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From: Pa. USA
I live up in the mountains and with a full load of gravel about 8 tons she does have a time getting up some of the hills so anything i could do to help the power. Within in my pocket book.
Grumpy goat
Joined: May 2017
Posts: 3,058
Likes: 594
Thanks for the replies guys, if i understand correctly the difference is the crank, rods and pistons? So if i were to use the crank and pistons from my old engine i wouldhave a 400?
and yes it is 2wd
i assume that the bell housing is the same for both?
and finally if one thinks it is a boat anchor, if i would change engines what would be recommended that would work with the same trans, dont want to change that as the dump works fine with the pto as is
and yes it is 2wd
i assume that the bell housing is the same for both?
and finally if one thinks it is a boat anchor, if i would change engines what would be recommended that would work with the same trans, dont want to change that as the dump works fine with the pto as is
The only non-335 series engine I know of that'll bolt up to your bellhousing is the 385 series, which will be a 460 ci engine. You can find them fairly cheaply. But keep in mind that you'll have to acquire a lot of other parts and change a few things, like all the brackets, pulleys, and other front dress items. You'll probably have to change the engine mount towers. I'm not sure if your clutch linkage will bolt up the same.
Laughing Gas
Joined: May 2011
Posts: 855
Likes: 40
From: SoCal
It's not a 400 if it has "351M" pistons in it; the pistons would hit the head.
The main journals for both are 3". The only differnce between the two engines are the crankshaft and pistons.
They do have a lot in common though, especially that they are both boat anchors in stock form. Make sure to put rod and main bearings in it before you install it since they're almost "maintenance items" every 50-60K miles and you don't want to pull the engine again (you said f350 dumper so I assume 2wd).
The main journals for both are 3". The only differnce between the two engines are the crankshaft and pistons.
They do have a lot in common though, especially that they are both boat anchors in stock form. Make sure to put rod and main bearings in it before you install it since they're almost "maintenance items" every 50-60K miles and you don't want to pull the engine again (you said f350 dumper so I assume 2wd).
Laughing Gas
Joined: May 2011
Posts: 855
Likes: 40
From: SoCal
Thanks for the replies guys, if i understand correctly the difference is the crank, rods and pistons? So if i were to use the crank and pistons from my old engine i wouldhave a 400?
and yes it is 2wd
i assume that the bell housing is the same for both?
and finally if one thinks it is a boat anchor, if i would change engines what would be recommended that would work with the same trans, dont want to change that as the dump works fine with the pto as is
and yes it is 2wd
i assume that the bell housing is the same for both?
and finally if one thinks it is a boat anchor, if i would change engines what would be recommended that would work with the same trans, dont want to change that as the dump works fine with the pto as is
Laughing Gas
Joined: May 2011
Posts: 855
Likes: 40
From: SoCal
Good, it's a great engine. It has the magic that the Cleveland and Boss engines had (canted valves). Like someone already said it was weighed down with retarded timing and low compression for smog. Fix those items and it will come to life.