IU suffix on a 327 block casting 3782870 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 03-02-2013, 10:07 PM
Registered User
 
Join Date: Mar 2013
Posts: 2
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
IU suffix on a 327 block casting 3782870

Hello
I am at a loss I found a 327 in a junkyard and am going to place it in a 1940 chevy truck on a s10 frame and when I had it cleaned the mechanist sent me the numbers off the block so I can find out more about it, and I know it is a 327 casting is # 3282870 is a 327 sbc but it has an IU suffix, which on all my research is an IU is from 427 435 hp the block and the other numbers read was FO40IU ,now is the IU strictly 427/435hp or is the IU just 435 hp. What i know is this motor had been taken out of a mid 60s grain truck. Can anybody help me with the code of FO40IU and why the suffix iu on a 327 i have not found any 327 with this suffix of IU on any of the chevy small block decoding sites.
Thanks

    Advertisement

Last edited by terry151965; 03-02-2013 at 10:29 PM. Reason: clarify
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-02-2013, 10:16 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 8,086
Wiki Edits: 0

Thanks: 322
Thanked 784 Times in 750 Posts
only about 6 years the 327 was made,,,cheaper to make one now.try paintedjester/327nut,cobalt327,one of these members will likely answer tomorrow Hc,also
what is your question
Reply With Quote Quick reply to this message
The Following User Says Thank You to vinniekq2 For This Useful Post:
terry151965 (03-03-2013)
  #3 (permalink)  
Old 03-03-2013, 10:17 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by terry151965 View Post
Hello
I am at a loss I found a 327 in a junkyard and am going to place it in a 1940 chevy truck on a s10 frame and when I had it cleaned the mechanist sent me the numbers off the block so I can find out more about it, and I know it is a 327 casting is # 3282870 is a 327 sbc but it has an IU suffix, which on all my research is an IU is from 427 435 hp the block and the other numbers read was FO40IU ,now is the IU strictly 427/435hp or is the IU just 435 hp. What i know is this motor had been taken out of a mid 60s grain truck. Can anybody help me with the code of FO40IU and why the suffix iu on a 327 i have not found any 327 with this suffix of IU on any of the chevy small block decoding sites.
Thanks
Suffix IU doesn't show up in my info. That's not surprising, many truck/commercial applications aren't listed. Neither does the casting number 3282870. However, 3782870 does show up as a small journal 327, used '62-'67.

All you really need to know is it has the small journal crank, and a 4" nominal bore. It has a 2-piece rear main seal. If the oil pan is original to the engine it'll use the thin type front oil pan seal.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-03-2013, 11:27 PM
Registered User
 
Join Date: Mar 2013
Posts: 2
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
427 in a sbc block casting # 3782870

Ater doing more reasearch on chevy commercial trucks with a block casting number of 3782870 it comes back as a 427 big block in that. that is what the IU on the suffix so it seems to be a 427/435 hp in a 3782870 block castings. after trying to run the piston numbers on the chevy i come up blank so these must be built for the 427. I sent you a link let me know what you think.
thanks. just follow the block castings




Casting Numbers
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-04-2013, 06:51 AM
hcompton's Avatar
Old & Furious
 
Join Date: Oct 2012
Location: MD
Age: 41
Posts: 1,074
Wiki Edits: 0

Thanks: 6
Thanked 87 Times in 84 Posts
I dont see the number your posted but

Here is what i can find for you. I am willing to bet the number is a 7 not a 2.

3782870
62-67
327
car & Truck 2-bolt

3782870
68-76
427
Truck Tall deck


As you can see the same casting number was used for the sbc and bbc in the 60's. Commecial applications sometimes reuse casting numbers as the tooling is already in place. I would bet its a normal 327.

Now this is not uncommon to find the block numbers and be more confused then when you started. Best thing to do from here is get the number off the crank and heads and see if they compare to the ones used on the normal 2 bolt 327. Normally with the crank and heads numbers you can figure out what you have and what type of car it was born in.

Remvoed from a 60's truck does not mean its original or even close. some engines float around from car to car for years. some get replaced a few years after the truck is purchased and the owner never looks back so no real way to tell by donor vehicle.
Reply With Quote Quick reply to this message
The Following User Says Thank You to hcompton For This Useful Post:
terry151965 (03-04-2013)
  #6 (permalink)  
Old 03-04-2013, 08:00 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by terry151965 View Post
Ater doing more reasearch on chevy commercial trucks with a block casting number of 3782870 it comes back as a 427 big block in that. that is what the IU on the suffix so it seems to be a 427/435 hp in a 3782870 block castings. after trying to run the piston numbers on the chevy i come up blank so these must be built for the 427. I sent you a link let me know what you think.
thanks. just follow the block castings




Casting Numbers
Well is it a big block? You said it was a 327, and a BBC sure looks nothing like a SBC so it should be pretty easy to see the difference.

Most 427 BBC used in large/commercial vehicles are a tall deck. Got a photo or two?
Reply With Quote Quick reply to this message

Recent Hotrodding Basics posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
3782870 david caza Engine 2 04-23-2011 04:53 PM
big block suffix Novaguy383 Engine 3 08-21-2008 07:36 PM
3970010 Block Suffix ABT jihrie Engine 2 11-20-2006 11:00 AM
66 327 truck motor suffix code YW Mr. Wormy Engine 2 01-14-2006 10:47 PM
327 block and casting #'s OneBad93LX Engine 7 12-05-2003 01:57 PM


All times are GMT -6. The time now is 09:37 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.