WhichTractor
  • Rigid chassis
  • WhichTractor size: Standard-size
  • No lab test on file
  • 1967–1969
  • 1,220 built

It sits on the standard-size/high-power boundary, so either size is a fair description. WhichTractor size, not the maker’s category

International Harvester 1256 Engine specs

9 engine values on record for the 1256.

Engine power, claimed · gross or net not stated

116.4 hp

86.8 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “IHC 1256”, claimed

This is the maker’s own figure, measured at the engine. Power at the PTO is lower — by how much, for this machine, nobody has measured.

What engine is in a 1256?

A 1256 has a INTERNATIONAL HARVESTER DT-407, a 6-cylinder 6.67 L diesel engine.

Engine — INTERNATIONAL HARVESTER DT-407 specifications
Make & modelINTERNATIONAL HARVESTER DT-407Source 1
FuelDieselSource 1
Cylinders6Source 1
Displacement406.9 ci · 6.67 LSource 1
CoolingLiquid-cooled
Air cleanerDry air filter
Cylinders6
Displacement7.0 qt · 6.7 L
Bore4.3 in · 109.75 mm
Stroke4.6 in · 117.48 mm
Rated engine speed2,400 rpm

Source · Traktorenlexikon, “IHC 1256”

Sources and how this page was built

9 engine values from Traktorenlexikon, “IHC 1026”; and Traktorenlexikon, “IHC 1256”.

Sources checked

14 SEP 2026

Spotted an error?

Sources

Facts taken from these documents, units converted. Numbers beside a figure refer to this list. Licences and attribution

  1. Traktorenlexikon: IHC 1026 — CC BY-SA 4.0, WIKIBOOKS-TL-118758 · revision 1055405. Wikibooks contributors (Traktorenlexikon). Original document
  2. Traktorenlexikon: IHC 1256 — CC BY-SA 4.0, WIKIBOOKS-TL-118784 · revision 1055410. Wikibooks contributors (Traktorenlexikon). Original document