"Hecho en Mexico" block - 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> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-03-2008, 09:26 PM
Registered User
 
Join Date: Aug 2008
Location: laramie, wy
Posts: 1
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
"Hecho en Mexico" block

I have recently aquired a chevy small block and I'm having trouble finding out exactly what it is. I have found Four numbers. 3970010 along with "hecho en mexico" on the back drivers side. 254 on the back passenger side. 010 on the drivers side in front of the oil filter. and the engine code is "MK01800." I have determined it is a replacement engine from mexico with %10 nickel (or tin?) added. It is either a 302, 327, or 350 and 2 or 4-bolt main (I have not removed the oil pan yet). I cannot find anything about the engine code since it seems to be in the wrong order, not the typical plant-date-suffix format. How can I determine what the displacement is for this engine (it's not casted that I can see) and what year it was made/assembled?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-03-2008, 09:36 PM
lets cut it up's Avatar
Registered User
 
Last photo:
Join Date: Oct 2007
Posts: 1,468
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I beleive a "010" block is a 350. I am not sure about the other numbers. I have heard that the mexican blocks are trouble though. Not sure exactly why though,Tim
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-03-2008, 11:37 PM
Registered User
 
Last photo:
Join Date: Jun 2007
Location: TN.
Posts: 287
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
you have a 350, back when the 302 and 327 blocks were built, mexico didn't know how to cast a block.

sam-missle
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-03-2008, 11:46 PM
JeffB's Avatar
Registered User
 
Last photo:
Join Date: Jul 2006
Location: Phoenix,AZ
Age: 68
Posts: 1,693
Wiki Edits: 0

Thanks: 2
Thanked 87 Times in 80 Posts
Mexican blocks

This is interesting,I had a 350 block like that in the truck I had, only did a balance and blueprint ,L-79 Cam,Flat tops,mild port to match,and it ran strong no problems.Now if this was a Ford 302 the Mexican blocks are in demand and stronger,go figure
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-04-2008, 01:46 AM
junior stocker's Avatar
Registered User
 
Join Date: Feb 2004
Location: Everett, Washington
Age: 63
Posts: 821
Wiki Edits: 0

Thanks: 0
Thanked 10 Times in 9 Posts
Hecho en Mexico block

Like a lot of people, I too have one of these; it was a G.M. crate motor I bought new. At 15,000 miles it dropped an exhaust valve, ruined one head and punched a hole in the piston. Only thing I can say about a "hecho en Mexico" block, is that it appears the cast iron must be "soft", as there was quite a ridge in the cylinders at the top of the bore; a lot more ridge than I would expect on a 15,000 mile motor. I'm still going to reuse the block, only with a large journal 327 crank, good rods, and a set of NOS G.M. hi-perf 10.35:1 pistons (the ones everyone seems to refer to as 11.0 or 11.5:1 compression ratio pistons). I think I'm going to grind the "hecho en Mexico" letters off the block so no one knows it really is, in my opinion, a block casted with inferior cast iron. At least that way, I won't have to deal with the stigma from others about it being a lousy block.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-04-2008, 10:53 AM
Twistedwrench's Avatar
No officer I wonít do it again
 
Last photo:
Join Date: Mar 2005
Location: Minnesota
Age: 45
Posts: 136
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Iíve built a couple of mills using hecho blocks and have had no troubles at all. Granted the they are both fairly mild and around the 350hp range. Just my experience with them.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-04-2008, 07:05 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 59 Times in 56 Posts
some years ago on here we had many discussions about these blocks. They are "target master" replacement engines from GM. To talk bad of them opened a can of worms with some. From what I had heard and read, they were soft, the cast iron was not the same quality and they wore very quickly. Others say they built them and ran them with high power and never had a single issue so I would say the debate is out. Some I would say are soft and the material used wasn`t that good, others I would say are fine to use, but it`s kind of hard to tell what you have cast iron wise by just a visual inspection and I`m not sure if there are any "hardness" testers for cast iron.
This is just my opinion on reading what many others have said of these blocks.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-16-2010, 08:29 AM
Registered User
 
Join Date: Apr 2010
Location: ohio
Posts: 1
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Small block chevy's with Hecto Mexico

I see I'm not the only one with questions and concerns about a block casted
anywhere else than the good old USA.
I have recently picked up a car that has a non-original 350 motor in it.
On the upper driver side rear block deck it has casted into it Hecto in Mexico. I tried to run the number to find out its origins but unfortunately the only thing that can be positively identified is that it is a 350 cubic inch, two
pc. main seal, and was made some time in the early to mid eighties.
The one thing that I clearly have noticed about this engine it is a little noiser that the motors from the late 60's and early 70's.
There is absolutely nothing wrong with the motor as everything has been check and inspected. But being around small block Chevy's my whole life I have never had a motor when it's running an from the underside you can the sound of internal components whirling around. Had a few other people familiar with small blocks take a listen and they said I was correct. Their thoughts where the noise was due to poor quality in the materials which were allowing sound to travel easier thru the block. If so what does this say for the strenght of the bock?
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 04-16-2010, 08:40 AM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 59 Times in 56 Posts
This thread is 2 years old. Sorry to say I`ve never heard of what your saying. Not saying it`s not possible, but I`ve never heard of a engine being more noisy because of the material it`s made of. Park it next to a engine casted in the USA that`s worn out and it`ll be plenty noisy too.
Reply With Quote Quick reply to this message

Recent Engine 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
Verify a 351w block. Not2psycho Engine 3 05-27-2007 04:23 PM
Big block questions, help please??? 67 sleeper Engine 20 05-15-2007 04:24 PM
Small Block to Big block pullies WakBordr7387 Hotrodding Basics 5 01-30-2007 12:35 AM
SBC Block I.D. Casting# confusion 1Fast65Elky Engine 2 10-13-2004 07:44 PM
Filling Block/ Hard Block??? camaroman7d Engine 8 01-15-2004 07:30 AM


All times are GMT -6. The time now is 10:16 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.