In your case, IH referred to the serial number as the chassis number. The serial and chassis numbers are interchangeable and mean the same thing. As I said before the 'serial' number listed is for the engine. I wonder why they didn't just say chassis number and engine number on the data plate. It's just a matter of terminology. All I know is that its the original engine that came in my truck. The International DT530. I've given my vin number hoping that it would help. If there are any other number that may help, please tell me locations and I will forward those number to you.

The International Harvester Company (IHC) has been building its own proprietary truck engines since the introduction of their first truck in 1907. International tended to use proprietary diesel engines. In the 1970s, IHC built the DVT 573 V-8 diesel of 240 and 260 hp (179 and 194 kW) but these were not highly regarded and relatively few were sold. Their DT 466 engine started in 1974 and was very successful.^[1]

IHC engines[edit]

The first IHC 'Highwheeler' truck had a very simple air-cooledhorizontally opposed two-cylinder engine with a 5-inch (130 mm) stroke and a 5-inch (130 mm) bore, and produced around 18–20 hp (13–15 kW). Displacement was 196 cubic inches (3.2 L).^[2] In 1915 a new L-headwater-cooled 201 cubic inches (3.3 L) inline-four engine appeared.^[3] While International's own engines underwent constant developments, the pace of truck production in the twenties was such that others' engines (from Waukesha, Buda, and Lycoming for instance) had to be installed in some parts of the range.^[4]

International Engine Serial Number Location

International Harvester's first in house six-cylinder engines appeared in some of the 1926 S-series trucks, seemingly a response to market pressures rather than to any particular need for such a layout.^[5] In 1928, a new heavy range of trucks (the HS-series) built around a series of engines from Hall-Scott appeared. These engines were used by IHC for some heavy-duty applications until 1935, although their own large engines (525 cu in (8.6 L) FBD and 648 cu in (10.6 L) FEB) had appeared in 1932.^[6] The medium-duty 1930 A-series trucks received the all-new 278.7 cu in (4.6 L) FB-3 six-cylinder engine, with overhead valves and seven main bearings. This was complemented by larger versions of the same engine and was built until late 1940 (as the FBB),^[7] the line-up being expanded downward by the smaller FA-series (later FAB) in 1933.^[8]

The HD inline-sixes, later to become the first in International's long running 'Diamond' series, first appeared in the C-30 truck of 1934.^[9] Available in three different displacements (see table), they were renamed 'Green Diamond' in late 1940 for the 1941 model year after a number of detail improvements.^[7] This year also brought the new 'Blue Diamond' (FAC) and 'Red Diamond' (FBC) engines. A post-war version of the 269 cubic inches (4.4 L) Blue Diamond became the 'Super Blue Diamond' when installed in the post-war medium L-line trucks. The Blue Diamond engine lived on until the early 60's renamed as Black Diamond engines, the BD-282 and BD-308.^[10]

International engine serial number location check

International Harvester Gasoline I4 Engines
Engine Family	Cylinder Layout	Displacement(s)	Fuel System Type	Years Produced
'Comanche' 4	I4	4-152 (152 cu in (2.5 litres)) 4-196 (196 cu in (3.2 litres))	Carburetor	1961-1972
International Harvester Gasoline I6 Engines
Engine Family	Cylinder Layout	Displacement(s)	Fuel System Type	Years Produced
HD Green Diamond	I6	HD/GD 175 (174.9 cu in (2.9 L))^[11] HD-3/GD 214 (3.5 litres; 213.3 cubic inches (3,495 cc))^[12] HD-2/GD 233 (233.9 cu in (3.8 litres))^[13]	L-head Carburetor	1934-1949
FAC^[7] Blue Diamond	I6	FAC 241 (241.5 cu in (4.0 litres)) BLD 250 (250.56 cu in (4.1 L))^[14] FAC260 (259.7 cu in (4.3 litres)) BLD269 (269.1 cu in (4.4 litres))	Carburetor	1941-1954
Silver Diamond^[10] Black Diamond/BD^[15] BG^[16]	I6	SD-220 (220.5 cu in (3.6 litres)) SD-240/BG-241 (240.3 cu in (3.9 litres)) BD-264/BG-265 (264.33 cu in (4.3 L)) The next two are the last versions of the Blue Diamond style engines now named Black Diamond engines. BD-282 (282.54 cu in (4.6 L)) BD-308 (308 cu in (5.0 litres))	Carburetor	1949-1969
FBC Red Diamond	I6	FBC/RED 318 (318.4 cu in (5.2 litres)) FBC/RED 361 (360.8 cu in (5.9 litres)) RD 372 (372 cu in (6.1 litres)) FBC/RED 401 (400.9 cu in (6.6 litres)) RD 406 (406 cu in (6.7 litres)) RED 450 then RD 450 (450 cu in (7.4 litres)) RD 501 (501 cu in (8.2 litres))	Governed Carburetor	1941-1974
International Harvester Gasoline V8 engines
Engine Family	Cylinder Layout	Displacement(s)	Fuel System Type	Years Produced
V/LV	V8	LV-401 (400.9 cu in (6.6 litres)) LV-461 (461 cu in (7.6 litres)) LV-478 LV-549 (548.7 cu in (9.0 litres) Re-engineered engine used in early 70's the V-537. A version of this engine never made it into trucks because of the gas crises of 1973. It was sold for industrial purposes as the V-605.	Governed Carburetor	1955-1974
MV	V8	MV-404 (404 cu in (6.6 litres)) MV-446 (446 cu in (7.3 litres))	Carburetor	1974-198?
SV 'Comanche'	V8	SV-266 (266 cu in (4.4 litres)) SV-304 (304 cu in (5.0 litres)) SV-345 (345 cu in (5.7 litres)) SV-392 (392 cu in (6.4 litres))	Carburetor	1959-1985

International Harvester/Navistar engines[edit]

Where Is The Engine Serial Number Located

International Harvester/Navistar V6/V8 Engine Family
Engine Family	Cylinder Layout	Displacement(s)	Injection Type	Years Produced
DV	V8	DV 462 - 7.6 L (460 cu in) DV 550 - 9 L (550 cu in) DV 550B - 9 L (550 cu in)	Direct injection	DV 462 - 1966-1988 DV 550 - 1966-1988 DV 550B - 1966-1988
D-Series D 150 D 170 D 190	V8	9 L (550 cu in)	Direct Injection	1962-early 1988
9.0L V8	V8	9 L (550 cu in)	Direct Injection	1966-1988
IDI (International/Ford)	V8	420 cubic inches (6.9 L) 444 cubic inches (7.3 L)	Indirect injection	1983-1987 (6.9L) 1988-1994 (7.3L)
T444E Original Ford PowerStroke	V8	444 cubic inches (7.3 L)	Direct injection	1994-2004
VT 2nd-generation Ford PowerStroke	VT275-V6 VT365-V8	275 cubic inches (4.5 L) 365 cubic inches (6.0 L)	Direct injection	2003-2010

Navistar DT engines[edit]

Navistar DT Engine Family
Engine Family	Cylinder Layout	Displacement(s)	Injection Type	Years Produced
PLN (Pump Line and Nozzle) DT 360 DT 466	Inline-6	DT 360 - 360 cubic inches (5.9 L) DT 466 - 466 cubic inches (7.6 L)	Direct Injection	1984-late 1995<

International Engine Serial Number Location