"vondon302" (vondon302)
04/20/2020 at 00:06 • Filed to: mopar, Yardlopnik
1
21|
"vondon302" (vondon302)
04/20/2020 at 00:06 • Filed to: mopar, Yardlopnik | 1
| 21 |
So I unearthed a old Mopar block in my yard.
!!! UNKNOWN CONTENT TYPE !!!
After further excavating. I unearthed a casting number.
And a casting date.
2899830 4-14-72
The whole bottom end is packed with gravel and I mean packed. This was after prying the rocks out.
From the casting code I think I have a 383. Neat! But from what I can tell Chrysler never made a 383 in 72 or very few at least.
After some wire wheel time on the data pad by the distributor, I could see it was stamped there but can’t get enough off of it.
HT 3
36 26
????
I checked the bore as best I could, and it’s well over 4 inches so that would make it a 400.
Problem is that the casting number doesn’t come up in any research I’ve done on 400s.
I’m kinda stumped now. Anybody know any Mopar block experts?
I wonder what else is buried back here. It’s been a good bottle mine too.
punkgoose17
> vondon302
04/20/2020 at 12:22 |
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I am wondering if it was cast in '70 as a 383 B and assembled in '72 as a 400 B? I really have no clue, just guessing.
lone_liberal
> vondon302
04/20/2020 at 12:23 |
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I’m no Mopar expert but ignorance has never stopped me from offering an opinion. It could be that it was installed in a ‘71 late in the production run or it could be a service replacement. I would guess the first one simply because I would think that April would be awfully early to be producing the ‘72s.
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vondon302
> punkgoose17
04/20/2020 at 12:25 |
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Makes sense. 72 was a change over year.
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vondon302
> lone_liberal
04/20/2020 at 12:35 |
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The service replacement idea is something I haven't thought of.
Gone
> vondon302
04/20/2020 at 12:51 |
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I’d put money on it being a 361 of all things
. Is the bore 4.125"? T
hey made industrial/HD 361s all the way to ‘
78. I would have guessed if that’s the case.
383 would be 4.25" bore
, 400 4.34". I can’t imagine it being a 383 because the c
asting date would be well after 71 model year. Maybe a chance it’s warranty engine, but the odds of that are so small. I’m also not sure if a
383 warranty engines would be replaced by a 400 or not
instead,
honestly.
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vondon302
> Gone
04/20/2020 at 12:58 |
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I thought the bore on a 383 was 4.03 ? It’s right around 4.2 to 4.3 so...
At least best I can tell with a ruler.
Damn digital calipers are dead but I haven't used em in years.
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vondon302
> Gone
04/20/2020 at 13:10 |
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Well damn that’s what I get for drinking and doing research.
4.25 is correct for a 383.
The mystery deepens.
Ordering batteries for my calipers now.
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Gone
> vondon302
04/20/2020 at 13:16 |
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Sounds like an 383 then. Gotta be a warranty block...maybe? I can’t think of anything else, as Ausgust-ish ‘71 should have been the changeover for ‘72 production.
RB 383 is 4.03" bore (3.75 stroke, same as rest of RBs - 413/426W and hemi/440) and was 59-60 only. The Bs - 350/361/383/400, have a 3.38 stroke.
You can try to get those numbers with a pencil rubbing.
My X-type is too a real Jaguar
> vondon302
04/20/2020 at 13:29 |
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One thing to remember Chrysler has always been perpetually broke, so nothing was wasted and anything is possible.
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vondon302
> Gone
04/20/2020 at 14:17 |
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Thanks. I’ll give it a try.
Well my knowledge of Mopar blocks has expanded exponentially at least.
user314
> vondon302
04/20/2020 at 14:21 |
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WTH? You just found a random engine block?
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vondon302
> user314
04/20/2020 at 14:36 |
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Uhm yeah.
And something kinda weird at that.
Urambo Tauro
> vondon302
04/20/2020 at 19:59 |
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This is fascinating. Please do keep us posted!
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vondon302
> Urambo Tauro
04/20/2020 at 20:44 |
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The OEM replacement theory is gaining ground. Got a few more leads to track down though.
Will do!
Future next gen S2000 owner
> vondon302
04/22/2020 at 11:34 |
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The better question is, what are you going to do with it?
Jim Spanfeller
> vondon302
04/22/2020 at 12:39 |
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Perhaps it was built for experimental/test purposes, and buried when they were done with it? Bear in mind I have no way of knowing if that’s true or not, I just think it could be a reason for the weird casting numbers.
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vondon302
> Jim Spanfeller
04/22/2020 at 13:12 |
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It’s the date that throws it off for a 383 but the few Mopar people I know are leaning towards OEM replacement. Got some casting pics of 400 vs 383 and a pencil rubbing to do but its snowing and I’m lazy.
It looks like it was wrapped in plastic at one point though. Neighborhood rumor is that they used to run a chop shop around here and ditch the shells in the woods. So....
More o come on that.
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vondon302
> Future next gen S2000 owner
04/22/2020 at 13:13 |
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????
Garden art?
I’d like to get the crank out but it’s doubtful.
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Future next gen S2000 owner
> vondon302
04/22/2020 at 13:23 |
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I’ll bet you could. Use a pres sure washer to get the dirt out, soak the whole thing in oil, and use a big hammer.
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vondon302
> Future next gen S2000 owner
04/22/2020 at 13:28 |
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Well now, sounds like challenge.
;)
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Future next gen S2000 owner
> vondon302
04/22/2020 at 17:42 |
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