806

[Chester5732]

I’m looking for an 80-100hp tractor. I loved the 806 that I had. Occasionally I come across an 806 gasser in pretty good shape. For the right price I would run one for awhile but how complicated would it be to put a 414 in one?  I know it wouldn’t be a direct fit but would it be like reinventing the wheel?

[HydroTek]

if you gonna modify , then just as well put a 12 valve 5.9 in there -- plenty of old rusted out Dodge trucks sitting around for a donor engine  -- Really depends on how "handy" you are if you can do the job or not

I would go with a '56 series because of the shifter -- the '06 was not one of my favorites strictly because of that straight line shift 

[stronger800]

I feel like the 400 series motor should be easier and cheaper than a 5.9. Need to extend frame rails, get an adapter plate, drill hole for exhaust, no big deal in my mind,  maybe dent in fuel tank to make some room. go for it.   With a turbo.

[stronger800]

Oops, lengthen hood, or modify front cover to make motor act shorter, should be able to find lots of discussion on this 

[Rick G.]

Just find you a nice 1066. 

[Chester5732]

55 minutes ago, Rick G. said:

Just find you a nice 1066. 

That’s what I would really like.  No luck so far. 

[HydroTek]

Seen a 1086 with 900 and some "original" hours last night 

looked pretty good , so may be the correct hours 

[brahamfireman]

2 hours ago, Chester5732 said:

That’s what I would really like.  No luck so far. 

By the time you buy an over priced 806 gas and a 414 your 80% of the way to a 1066 and still haven't done any work putting it together. 

What's your budget?

 

[Chester5732]

21 minutes ago, brahamfireman said:

By the time you buy an over priced 806 gas and a 414 your 80% of the way to a 1066 and still haven't done any work putting it together. 

What's your budget?

 

It’s not so much the budget as finding a nice 1066 that isn’t over priced and still needing a pile of work. 

[acem]

Are you wanting a cab or open station tractor?

[Chester5732]

7 hours ago, acem said:

Are you wanting a cab or open station tractor?

Open station unless the cab has AC. I’m getting old. 

[Matt Kirsch]

The hard part in any of this is finding a good used engine unless you've already got a line on one. It's not 1985 anymore, and there aren't salvage yards full of worn out 14XX series combines with low-hour engines in them "everywhere" anymore. Any 14XX combine you find intact these days probably should stay that way. The 12-valve 5.9 Cummins that is used for the conversion is also getting long in the tooth and they're highly sought after by the "Billy Big Rigger" types so that's a competitive market. You could be months or years, and driving halfway across the country. Even then you might still end up with a paperweight that needs a full overhaul, and some may say it's not even worth putting the engine in UNLESS you tear it down and do that complete overhaul first.

Repairs are overpriced too. You can buy a cheap basket case 806 that needs everything for little of nothing, and easily end up with more in it than if you just bought that overpriced 1066 that needed a few things and fixed those few things in the first place.

[stronger800]

Exactly that too. 

[HydroTek]

4 hours ago, Matt Kirsch said:

The hard part in any of this is finding a good used engine unless you've already got a line on one. It's not 1985 anymore, and there aren't salvage yards full of worn out 14XX series combines with low-hour engines in them "everywhere" anymore. Any 14XX combine you find intact these days probably should stay that way. The 12-valve 5.9 Cummins that is used for the conversion is also getting long in the tooth and they're highly sought after by the "Billy Big Rigger" types so that's a competitive market. You could be months or years, and driving halfway across the country. Even then you might still end up with a paperweight that needs a full overhaul, and some may say it's not even worth putting the engine in UNLESS you tear it down and do that complete overhaul first.

Repairs are overpriced too. You can buy a cheap basket case 806 that needs everything for little of nothing, and easily end up with more in it than if you just bought that overpriced 1066 that needed a few things and fixed those few things in the first place.

Can get brand new 12 valves  -- but that is not the only option 

[Powered by IH]

On 7/31/2026 at 9:13 AM, Chester5732 said:

I’m looking for an 80-100hp tractor. I loved the 806 that I had. Occasionally I come across an 806 gasser in pretty good shape. For the right price I would run one for awhile but how complicated would it be to put a 414 in one?  I know it wouldn’t be a direct fit but would it be like reinventing the wheel?

Out of curiosity have you ever considered a 766? About inline with the HP you want, less desirable for many people, and a lot of parts interchange with bigger tractors. Only problem is they are kinda uncommon.

[stronger800]

706 and 756 are both shorter in height, right? Causing more  in the event that he ever did want to do a motor swap

[Matt Kirsch]

5 hours ago, stronger800 said:

706 and 756 are both shorter in height, right? Causing more  in the event that he ever did want to do a motor swap

Correct. Less room for activities under the hood. About 4" if I'm not mistaken.

13 hours ago, Powered by IH said:

Out of curiosity have you ever considered a 766? About inline with the HP you want, less desirable for many people, and a lot of parts interchange with bigger tractors. Only problem is they are kinda uncommon.

Don't know about "less desirable." All the collectors around here want one to complete their 66 series collections, so much so that you can't touch one for reasonable money. Lots more 1066's to choose from.

[Gearclash]

15 hours ago, Powered by IH said:

Out of curiosity have you ever considered a 766? About inline with the HP you want, less desirable for many people, and a lot of parts interchange with bigger tractors. Only problem is they are kinda uncommon.

I second that thought, having run both.  The 7 is a better chore tractor than the 10.  The 10 is only a better choice if you need the high end power.  The 7 has much better lugging characteristics with its long stroke engine (the diesel anyway). 

[stronger800]

You know, I read “706”, not 766….my error.  766’s just about do not exist in my area of NY.  Never have. 706’s are about as scarce.  10s and 14’s outnumber 7’s and 9’s about 50:1, my estimate.   And If there is a 7 or a 9…..there’s a better than 50% chance somebody put a turbo on it, wishing they had a 10.   Basically.