Newbie here. Just got a 64 D100, With a six and 3 speed manual.
How do find out what the engine is? Cubic inch HP. The body tag does not give that detail.

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"Hewy"

If it's stock it's a 225CI.
A pic will tell a thousand words.

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Dodge truck sites state two sizes were available for trucks. 170 ci and 225 ci.
How do you tell the difference?

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"Hewy"

How long is the short water pump bypass hose next to the water pump?

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Almost certainly a 225; the 170 was a seldom-ordered "fleet only" option. Take a look at the short piece of heater hose that goes between the top of the water pump and the bottom of the front of the head. If it's about 3" tall, it's a 225. If it's about 1" tall, just barely visible between the clamps, it's a 170. For more specific ID, check the number cast into the block under the manifolds, and the numbers stamped into the engine ID pad. The pad is at the top of the block, facing the sky, below the frontmost spark plug and inboard of the ignition coil. You may have to scrape away grease and grime to read the numbers.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Thanks for info
The water hose on top of water pump is 3"
Here are the numbers . Top engine pad passenger side :
VT 22 3 I6 2 ( note I6 might be 16 )
Engine block under manifolds :
3 1364
2463430-1 ( note the 6 might be an 8 )
1162
So what does all this tell you? Is there a decoder forum? Also the body ID tag shows net HP 127.

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"Hewy"

V: 1964 model year
T: Truck engine
22: 225 CID
3 16: Made on March 16, 1964
2: 2nd shift

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

What color is the paint on the engine?
DD

Thanks guys appreciate the lesson.
The engine is painted yellow.

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"Hewy"

Doc correct me if i be wrong here....but that would be an industrial engine with exhaust valve rotators....

keep on roddin'

Probably no rotators, no; the 225-3 used in ridiculous applications (school buses and other vehicles far too big for a six) got rotators and other extreme-duty components, but the 225-1 and 225-2 in truck service did not.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

The early truck motors were just yellow. I have one laying in my shop now. Nothing special about it.

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Official Cookie and Mater Tormentor.

Well, I wouldn't go that far in the other direction. Even the standard-duty engines used in trucks had some more stringent inspection limits (no weld repair allowed on blocks, no cranks that had to be straightened, etc.).

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

way back in the day I both welded blocks and straightened cranks,
nothing about either process or the lack,,of makes them special, especially back then,, before gauge R&R....

The "nice stuff" I find in HD SL6 engines include:
Double row "roller" timing chain.
A high volume (1 inch thick impeller) oil pump.
Shot peened crank and con rods.
Stellite faced and / or sodium filled exhaust valves.
Exhaust valve rotators.

The DR timing chain is easy to spot and a trained eye can see the thick oil pump at a glance.
A shot peened crank and rods are hard to see... but you can see the peening when everything is clean.
You can see the rotators but the exhaust valve material / quality is hard to ID.

As I have said before, don't waste time looking for this stuff. If you want it in your engine, build it into your engine.
Start with a "nice" block and build it up with all the "best" parts available today and you will have yourself a SL6 that is better then anything the factory put together.
DD