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#2414363 - 12/06/17 05:08 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
EV2Bird Offline
On Vacation

Registered: 06/23/14
Posts: 3116
Loc: Kansas Roads Between 0 and 140...
Why it was serialized and never built and installed is still a mystery.

If-s, maybes, should of-s, this is odd, although ive never had a mystery come into play, but all the others have in the end simply cost me extra money or more then not wasted money.

If it were mine id toss it on CL at the going rate of a used block, suggest the buyer bring any tool he needed to measure and make a decision and sell it as is, where is.

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#2414436 - 12/06/17 07:23 PM Re: WIW? 1971 NOS 340 block [Re: ScottSmith_Harms]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
Originally Posted By ScottSmith_Harms
Quote:
. Why it was serialized and never built and installed is still a mystery.


Its not a mystery, showing wear (or not) the assembly date verifies that it was once assembled, and if it has a VIN# stamping it was installed into a car as well.


Well then... if so, the mystery is; why did they build the engine without honing the cylinders? Maybe that is why they took it out before there was any wear. It would have smoked and used a bit of oil... Maybe there is another explanation. Were there no anomalies at the Chrysler plants back in the day? Could it have been a replacement block, sent to a dealer and never assembled for some reason? One thing I have learned in my profession (QA) is that just because there is a process, doesn't mean that it is always followed with no exceptions.
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Building '41 Chevy street rod with Mopar LA power. I tell my Chevy buddies it's on the Chevrolet improvement Program.

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#2414438 - 12/06/17 07:27 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
Alaskan_TA Offline
Fluffy Balladeer

Registered: 01/20/03
Posts: 26148
Loc: Still moving in.
Honing marks disappear with wear.

Check my previous post too if you missed it? ;-)

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#2414470 - 12/06/17 08:28 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
76orangewagon Offline
member

Registered: 01/06/12
Posts: 52
Loc: Akron, ohio
P.M sent...

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#2414490 - 12/06/17 09:07 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
EV2Bird Offline
On Vacation

Registered: 06/23/14
Posts: 3116
Loc: Kansas Roads Between 0 and 140...
Why did they build the engine without honing the cylinders?

Dude they didnt, get a grip.

Really with the revelation of its deep pitting id say if anything they did the old chevy guy trick, use an old boring bar to cut a couple thousands of ugly out of it to make it look fresh.

Do you even know what a real NOS 340 block bore measures out to before honing? Clearly not.

With it being stamped and needing cut .030 just use it and be happy, no lotto ticket to cash in on here.

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#2414608 - 12/07/17 08:22 AM Re: WIW? 1971 NOS 340 block [Re: EV2Bird]
an8sec70cuda Offline
I Live Here

Registered: 01/19/03
Posts: 10245
Loc: Marion, South Carolina [><]
Originally Posted By EV2Bird


Do you even know what a real NOS 340 block bore measures out to before honing? Clearly not.

With it being stamped and needing cut .030 just use it and be happy, no lotto ticket to cash in on here.

iagree If it had never been honed, it would not be at standard bore.
_________________________
CHIP
'70 hemicuda...8.91 at 150.5 mph street car...Mopar Action feature Dec. '14
'69 road runner 446" w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'01 Ram 2500 QCSB 4x4 Cummins...toy hauler
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#2414650 - 12/07/17 09:48 AM Re: WIW? 1971 NOS 340 block [Re: EV2Bird]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
Originally Posted By EV2Bird
Why did they build the engine without honing the cylinders?

Dude they didnt, get a grip.

Really with the revelation of its deep pitting id say if anything they did the old chevy guy trick, use an old boring bar to cut a couple thousands of ugly out of it to make it look fresh.

Do you even know what a real NOS 340 block bore measures out to before honing? Clearly not.

With it being stamped and needing cut .030 just use it and be happy, no lotto ticket to cash in on here.


Well, you guys are awesome and clearly knowledgeable and correct. Not looking for a "lotto" ticket; just wanting to know what I have before I waste it by putting it in a Chevy.
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Building '41 Chevy street rod with Mopar LA power. I tell my Chevy buddies it's on the Chevrolet improvement Program.

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#2414657 - 12/07/17 10:01 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
"
Do you even know what a real NOS 340 block bore measures out to before honing? Clearly not."

I do not; so please educate me. What does a real NOS 340 block measure out to before honing? I am just curious.... Thanks again for sharing your knowledge.


Edited by 41MoChev (12/07/17 10:03 AM)
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Building '41 Chevy street rod with Mopar LA power. I tell my Chevy buddies it's on the Chevrolet improvement Program.

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#2414661 - 12/07/17 10:19 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
EV2Bird Offline
On Vacation

Registered: 06/23/14
Posts: 3116
Loc: Kansas Roads Between 0 and 140...
Rough from the foundry, if you could find one, can be a small as 4.00, machine shop rough could be in the low 4.03-s.

Modern shops leave .003-.005 to hone.

If it were an over the counter ready to build block it would already be honed.

One of my nos 318 based race blocks should be 3.91 and its rough at 3.87.

You and the machine shop would spot factory unfinished a mile away, small bore and very very rough machine work, you would see and fell the ridges along the whole bore.

And these blocks in rough shape would have no vin on the pad.

If its not too hard to get to I will post pics later today.

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#2414819 - 12/07/17 03:04 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
UPDATE: I just picked the block up from the machine shop. The machine shop owner (30 years experience in automotive machining) stated that it appeared to never have been built. Bores are exactly 4.04. There are no hatch marks, no visible or measurable wear. He agreed that due to the serialization it probably had been built and installed in a new car. His guess is that the car was totaled with less than 2,000 miles on it and parted out. Engine must have been disassembled, parted, and the block cleaned removing all traces of paint.
Now that is the most plausible explanation so far...

Unfortunately; the block sat somewhere for years without proper protection and developed the pitting in the cylinder walls. No big deal; I will just build it .30 over and be happy with it in my Chevy.
_________________________
Building '41 Chevy street rod with Mopar LA power. I tell my Chevy buddies it's on the Chevrolet improvement Program.

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#2414836 - 12/07/17 03:34 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
Alaskan_TA Offline
Fluffy Balladeer

Registered: 01/20/03
Posts: 26148
Loc: Still moving in.
Look on the front of the block below the driver side head surface & there will be another series of numbers that was stamped after the engines final assembly, including the date it was done.

It likely starts GM 340 P & then two sets of 4 numbers each.

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#2414855 - 12/07/17 04:10 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
hemicar1971 Offline
master

Registered: 01/19/03
Posts: 4437
Loc: Chicago Blackhawks
Sell the 1971 340 block to someone that needs it or thinks they need a 1971 340 Block if you are building a big cube small block. Start with a 360 block that costs a lot less than a so called date coded 1971 340 block. Buy a stroker kit and make 400 plus cubes and buy a nice set of heads with some work. The 1971 Block means nothing to you but a price tag so sell it and get some money to build the motor you want. If you advertise the serial number on the pan rail maybe the original body can be found to the motor and the owner might pay you a little more money.
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#2414857 - 12/07/17 04:16 PM Re: WIW? 1971 NOS 340 block [Re: Alaskan_TA]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
Originally Posted By Alaskan_TA
Look on the front of the block below the driver side head surface & there will be another series of numbers that was stamped after the engines final assembly, including the date it was done.

It likely starts GM 340 P & then two sets of 4 numbers each.


See page 1, original post and photos: "Foundry & date stamping: GM 340P 35060091 (Mound Road Detroit plant, March 4 1971, 91st block that day."

Yes, this must prove it was assembled. I'm going with the theory that the car was wrecked right after it drove off the lot. Not too unlikely. Maybe daddy bought it for his 16 year old who punched it and did a 360 totaling the car. Wouldn't be the first time for that scenario. drive
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Building '41 Chevy street rod with Mopar LA power. I tell my Chevy buddies it's on the Chevrolet improvement Program.

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#2414861 - 12/07/17 04:20 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
Alaskan_TA Offline
Fluffy Balladeer

Registered: 01/20/03
Posts: 26148
Loc: Still moving in.
Aha.

I missed that, sorry.

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#2414940 - 12/07/17 06:52 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
EV2Bird Offline
On Vacation

Registered: 06/23/14
Posts: 3116
Loc: Kansas Roads Between 0 and 140...
Also, although late now if it had been a nos block it would of had factory freeze plugs in it, a little diamond I think with a p in the middle and always when in doubt, look at inside at the water jackets (cylinders) as even if antifreeze was used they still stain.

A block is only "new" one time and its pretty easy to spot the smaller details.

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#2414944 - 12/07/17 07:04 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
hemicar1971 Offline
master

Registered: 01/19/03
Posts: 4437
Loc: Chicago Blackhawks
The Vehicle could of been in an accident and the drive train pulled and the body sent to the wreckers. It could of sat in the wreckers for years and years and bought later in life and is now back on the road. Just read about the A12 1969 Super Bee Mod Top that was dragged out of the southern USA Auto Wreckers and up to Canada and then sold back into the USA. I sold an A12 Road Runner to a friend 30 years ago body only and he was contacted last year by a person that had the original motor to the A12. Things happen for the good sometimes with information on the internet.

BS23H1B345752 could be the vehicle the motor was from.

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#2415123 - 12/08/17 07:30 AM Re: WIW? 1971 NOS 340 block [Re: EV2Bird]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
Originally Posted By EV2Bird

With it being stamped and needing cut .030 just use it and be happy, no lotto ticket to cash in on here.


This is the advice I'm going with. You guys have convinced me that the block is no big deal. I didn't buy it to sell it, I bought it to build it. I have always been partial to Mopars; especially the 340 which I have never been fortunate enough to own. Turning the tables on the Chevy guys with a Mopar 340 is just icing on the cake.
Jim
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Building '41 Chevy street rod with Mopar LA power. I tell my Chevy buddies it's on the Chevrolet improvement Program.

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#2415166 - 12/08/17 09:19 AM Re: WIW? 1971 NOS 340 block [Re: Alaskan_TA]
plumcrazycuda Offline
top fuel

Registered: 12/14/03
Posts: 1701
Loc: PA
I have a block can you tell me what original car was by the vin stamp? The casting date is 5 of 70. And if car is out there by chance! If it is I would sell it for what I have into it. Stamping is 1B157379.


Attachments
5F047E6E-A7C8-4FE9-BEA1-17EDFE821AD4.jpeg (38 downloads)
46EF8733-DE5C-4C48-8E02-83C049A2BBBB.jpeg (22 downloads)



Edited by plumcrazycuda (12/08/17 09:24 AM)
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70 Cuda
73 barracuda
73 Barracuda
Looking for my build sheet or fender tag for my 70 Cuda Vin BS23H0B438517. Please look in your Blue on Blue Cuda or Challenger for the build sheet. My car was built in 7/70.

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#2415268 - 12/08/17 12:36 PM Re: WIW? 1971 NOS 340 block [Re: plumcrazycuda]
6bblgt Online   content
I Live Here

Registered: 01/20/03
Posts: 15048
Loc: Las Vegas, NV
LM29H1B157379 - Dodge Demon 340 drive new to me, I have no info on the car
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#2416141 - 12/10/17 10:25 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
If you want to trade your block then put it in the proper forum. Not here.


Edited by tboomer (12/10/17 12:54 PM)
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Building '41 Chevy street rod with Mopar LA power. I tell my Chevy buddies it's on the Chevrolet improvement Program.

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