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#2403283 - 11/13/17 08:18 PM WIW? 1971 NOS 340 block
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
I'm trying to decide whether to keep and build or sell this block. I need to know if it is valuable for restorations. If I sell it I want to get a fair price. Foundry & date stamping: GM 340P 35060091 (Mound Road Detroit plant, March 4 1971, 91st block that day. Block has never been honed, never had a piston in it (bore 4.0325").

Trying to insert photos. Do they show-up?

https://scontent-iad3-1.xx.fbcdn.net/v/t...amp;oe=5A99A9C6

https://scontent-iad3-1.xx.fbcdn.net/v/t...amp;oe=5A9D42C7

https://scontent-iad3-1.xx.fbcdn.net/v/t...amp;oe=5A9C4CF1
_________________________
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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#2403320 - 11/13/17 09:22 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
fastmark Offline
master

Registered: 01/20/03
Posts: 4415
Loc: Abilene, Texas
Looks like a good block to me if it’s NOS. I’d say it’s a $1000 block at least.

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#2403355 - 11/13/17 10:27 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
ScottSmith_Harms Offline
Mr Wizzard

Registered: 01/20/03
Posts: 41435
Loc: Spokane Washington
I bought 2 this year, both were good deals at $500.00 each, anything between that and $1000.00 seems fair.

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#2403431 - 11/14/17 08:01 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
$1,000 is kind of a decision point for me. If it is not worth at least $1000 I'll keep and build it and put in my '41 Chevy. Before I sell or build I will get it checked by a machine shop just to make sure there is nothing wrong with it.

https://scontent-iad3-1.xx.fbcdn.net/v/t...amp;oe=5A92286C

https://scontent-iad3-1.xx.fbcdn.net/v/t...amp;oe=5A90F98F

https://scontent-iad3-1.xx.fbcdn.net/v/t...amp;oe=5A683F8F
_________________________
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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#2403437 - 11/14/17 08:34 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
ScottSmith_Harms Offline
Mr Wizzard

Registered: 01/20/03
Posts: 41435
Loc: Spokane Washington
It has a VIN# stamped into it so it's used, not NOS


Attachments
340 VIN.jpg



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#2403466 - 11/14/17 10:00 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
fastmark Offline
master

Registered: 01/20/03
Posts: 4415
Loc: Abilene, Texas
That is a new deal now. It a used block. Now we have to know the exact condition of the block to determine the price. The main thing being the ACTUAL bore size, done with a mic at the largest point on the cly wall. Check at the top of the bore with an ID mic right where the ring travel stops. That will tell you what size it is and how far it needs to be bored over.

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#2403486 - 11/14/17 10:40 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
fk5hemi Offline
member

Registered: 02/24/07
Posts: 107
Loc: fargo,nd
Hell, if you could get $400 for that block, it would go a long way into rebuilding a 350.

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#2403630 - 11/14/17 04:06 PM Re: WIW? 1971 NOS 340 block [Re: ScottSmith_Harms]
minivan Offline
master

Registered: 01/13/04
Posts: 9066
Loc: Eugene, Oregon
Originally Posted By ScottSmith_Harms
It has a VIN# stamped into it so it's used, not NOS


Oh Scott, you just ruined this guys visions of "Mecum" millions.... LOL

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#2403690 - 11/14/17 06:04 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
I took it to a machine shop this morning for a complete evaluation. If it turns out to be a run of the mill used block, only worth $400 - $500, I'll be happy to bore it, stroke it, and put in my '41 Chevy; no regrets or second thoughts.
_________________________
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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#2403697 - 11/14/17 06:13 PM Re: WIW? 1971 NOS 340 block [Re: fk5hemi]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
Originally Posted By fk5hemi
Hell, if you could get $400 for that block, it would go a long way into rebuilding a 350.


oh the sacrilege! eek One way or another the old Chevy is getting Mopar motivation. Gotta' turn the tables on the Chevy guys. grin
_________________________
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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#2403698 - 11/14/17 06:21 PM Re: WIW? 1971 NOS 340 block [Re: minivan]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
Originally Posted By minivan
Originally Posted By ScottSmith_Harms
It has a VIN# stamped into it so it's used, not NOS


Oh Scott, you just ruined this guys visions of "Mecum" millions.... LOL

cry cry And I thought I had hit the jackpot! drinking
whistling
_________________________
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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#2403713 - 11/14/17 06:46 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
minivan Offline
master

Registered: 01/13/04
Posts: 9066
Loc: Eugene, Oregon
Originally Posted By 41MoChev
Originally Posted By minivan
Originally Posted By ScottSmith_Harms
It has a VIN# stamped into it so it's used, not NOS


Oh Scott, you just ruined this guys visions of "Mecum" millions.... LOL

cry cry And I thought I had hit the jackpot! drinking
whistling


Your a good sport..... bow

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#2403899 - 11/15/17 08:33 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
68427vette Offline
top fuel

Registered: 01/07/10
Posts: 1992
Loc: midwest
scott, what does this block go into,, im looking for a 71 340/block, for a 71 challenger,

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#2403919 - 11/15/17 09:29 AM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
ScottSmith_Harms Offline
Mr Wizzard

Registered: 01/20/03
Posts: 41435
Loc: Spokane Washington
What is the SPD of your 71 68427vette?

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#2404209 - 11/15/17 06:38 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
71GTX471 Offline
pro stock

Registered: 01/28/03
Posts: 1219
Loc: Harriman NY
Id trade you a 76 4 bolt main 350 block for it.

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#2404297 - 11/15/17 09:06 PM Re: WIW? 1971 NOS 340 block [Re: 71GTX471]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
Originally Posted By 71GTX471
Id trade you a 76 4 bolt main 350 block for it.


Thanks, but I'm not interested in any SBC. It's gotta' be Mopar power.
_________________________
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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#2404541 - 11/16/17 02:02 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
It has a VIN# stamped into it so it's used, not NOS


After some research I found that the stamping is the last eight digits of the VIN and mean: 1971, Dodge Main Hamtramck, then sequence built. But you probably already knew that.

https://moparcarparts.com/ENGINEiDENT

I will post the results of the machine shop findings when I get them.


Edited by 41MoChev (11/16/17 02:07 PM)
Edit Reason: added link to reference
_________________________
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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#2414237 - 12/06/17 12:33 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
41MoChev Offline
member

Registered: 05/21/17
Posts: 26
Loc: VA
Originally Posted By 41MoChev
Originally Posted By ScottSmith_Harms
It has a VIN# stamped into it so it's used, not NOS


After some research I found that the stamping is the last eight digits of the VIN and mean: 1971, Dodge Main Hamtramck, then sequence built. But you probably already knew that.

https://moparcarparts.com/ENGINEiDENT

I will post the results of the machine shop findings when I get them.


UPDATE: Machine shop just finished checking the block. Good news is that they verified it is standard bore (4.04), good pressure check, crank journal alignment good, and block surfaces are good. As I stated originally, this block has no wear and has never been honed. Why it was serialized and never built and installed is still a mystery. Now the bad news. There is some pitting in the cylinder walls due to storage and moisture. Machine shop estimates it will take 0.030-over to clean it up.
Jim
_________________________
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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#2414328 - 12/06/17 03:43 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
ScottSmith_Harms Offline
Mr Wizzard

Registered: 01/20/03
Posts: 41435
Loc: Spokane Washington
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.

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#2414342 - 12/06/17 04:16 PM Re: WIW? 1971 NOS 340 block [Re: 41MoChev]
Alaskan_TA Offline
Fluffy Balladeer

Registered: 01/20/03
Posts: 26136
Loc: Still moving in.
It is from a 1971 Cuda.

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