Help Identifying Original Mopar Engine for Dodge D300

[jas80]

Hello everyone,

I have a Mopar engine in its original box that has never been opened and still retains its original seals and metal straps. The replacement engine was purchased around 1984 for a small Dodge D300 truck manufactured between 1970 and 1975. I do not want to break the original straps, so I need to identify the exact model of the engine without opening the box.

To help with identification, here are the box measurements and some technical data (box weight):

• Box Measurements (converted to inches):
  • Length: 49 cm ≈ 19.3 inches
  • Width: 63 cm ≈ 24.8 inches
  • Height: 36 cm ≈ 14.2 inches
• Technical Data (Box Weight):
  • Puncture Test: 1100 units
  • Combined Cladding Weight: 264 lbs per 1,000 ft²
  • Maximum Size: 120 inches
  • Gross Weight: 350 lbs

I would greatly appreciate any information, experiences, or suggestions that could help me determine the exact model of this Mopar engine.

Thanks in advance for your help!

Best regards,

 

[RustyRatRod]

 

[RustyRatRod]

Oh and welcome aboard!

 

[mopar head]

Open it up, get the #s off it, take good pictures of it and put new straps back on, nobody's going to buy an unseen mystery engine.

 

[1WildRT]

Hello everyone,

I have a Mopar engine in its original box that has never been opened and still retains its original seals and metal straps. The replacement engine was purchased around 1984 for a small Dodge D300 truck manufactured between 1970 and 1975. I do not want to break the original straps, so I need to identify the exact model of the engine without opening the box.

To help with identification, here are the box measurements and some technical data (box weight):

• Box Measurements (converted to inches):
  • Length: 49 cm ≈ 19.3 inches
  • Width: 63 cm ≈ 24.8 inches
  • Height: 36 cm ≈ 14.2 inches
• Technical Data (Box Weight):
  • Puncture Test: 1100 units
  • Combined Cladding Weight: 264 lbs per 1,000 ft²
  • Maximum Size: 120 inches
  • Gross Weight: 350 lbs

I would greatly appreciate any information, experiences, or suggestions that could help me determine the exact model of this Mopar engine.

Thanks in advance for your help!

Best regards,

D300 = One Ton Truck... Not Particularly "Small" likely Engine options, /6, 318, 360, 400, 440
19.3 x 24.8 x 14.2 Not very big not long enough to be a /6, not tall enough to be a big block
Gross Weight 350 lbs.... Not very heavy... Not heavy enough to be a long block...

My "guess" would be a 360 short block....

And yes, you need to open it... You don't know what you have & you don't know anything about it's condition..

 

[slantsixdan]

You're going to have to choose: leave the box strapped shut or identify the engine. One or the other; you cannot have both.

 

[junkyardhero]

D300 = One Ton Truck... Not Particularly "Small" likely Engine options, /6, 318, 360, 400, 440
19.3 x 24.8 x 14.2 Not very big not long enough to be a /6, not tall enough to be a big block
Gross Weight 350 lbs.... Not very heavy... Not heavy enough to be a long block...

My "guess" would be a 360 short block....

And yes, you need to open it... You don't know what you have & you don't know anything about it's condition..

D3's also came with 383's
[source: i have one]

however, i agree with your assessment of it likely being a 318/360 short block

 

[67Dart273]

Agree with others. As old as that is, moisture/ humidity could have migrated in and caused damage. NOBODY is going to pay "extra" just because a engine has not been uncrated.

 

[remytherat]

Given that it was purchased new 5 years after the last of the big blocks were made and seems pretty light, my money’s on 360 short block or even just a bare block given how small the package seems

 

[mopar head]

Given that it was purchased new 5 years after the last of the big blocks were made and seems pretty light, my money’s on 360 short block.

I see no value in it being untouched. I wouldn’t use it without pulling valve covers and the oil pan to inspect and probably replace the (likely) rotten rear main, valve stem seals, etc

Short block wouldn`t have any of that on it anyhow

 

[Oldmanmopar]

Drill small holes on the sides and look in there with a scope. The are cheap at Harbor freight.

 

[doug 371]

I'll guess 318 short block lol

 

[RustyRatRod]

I'll guess 318 short block lol

Probably correct.

 

[RAT ROD AL]

I bet it's this. Chrysler was flooding the market with these leftover motors in the 80s since they didn't make the car to put em in. That box is worth a fortune left unopened and untouched.

I would say about

 

[toolmanmike]

I bet it's this. Chrysler was flooding the market with these leftover motors in the 80s since they didn't make the car to put em in. That box is worth a fortune left unopened and untouched.
View attachment 1716366007
I would say about
View attachment 1716366008

 

[RustyRatRod]

I bet it's this. Chrysler was flooding the market with these leftover motors in the 80s since they didn't make the car to put em in. That box is worth a fortune left unopened and untouched.
View attachment 1716366007
I would say about
View attachment 1716366008

You got mental issues. I'm plum proud to know you. lol

 

[volaredon]

Specs on cardboard material as listed have nothing to do with what's inside that cardboard.

 

[Lefty71]

Pix may help.....is the box slanted in any way?? Jk

Im finding hard to believe its even any kind of short block at only 14" tall, including the box.

 

[mopar head]

How long before Elons star link makes it over Peru again?
Hello OP...

 

[slantsixdan]

It's Schroedinger's engine: with the box strapped shut, it is and isn't an engine. It is and isn't a 225. It is and isn't a 318. It is and isn't a 360. It is and isn't a 440. It is and isn't a one-of-one aluminum 440 Hemi.

Once you open the box, all the quantum realities collapse to an actuality. That's a lotta power to wield.



But seriously, though: what do you think you're going to do with this sealed-box thing? Try to sell it…? Who's going to buy it for more than scrap value just based on a guess at what might be inside it? They're going to justifiably want hard proof. Or do you mean to keep it as a sort of hands-off time capsule, just guessing at what's inside for the next…year? Five years? Ten years? Twenty? Hope you have a lot of free space and an understanding spouse.

I don't get it. Seems to me the way to maximize its value is to set up a video camera, then remove the straps (and keep them) and video the opening and discovery. If you do that, post the vid here, eh!

 

[mopar head]

He may have been abducted by a herd of wild alpacas, I`m getting worried

 

[jas80]

In summary, I have to open the box....

 

[volaredon]

Yeah

 

[ProjectBazza]

I guess my first question would be: How is it that you don't know what's in there? Are you not the person who placed the order, and if not, where is that person?

 

[Lefty71]

Hes in another box??