engine decode check me on this! - Impala Tech
Tag Team De-coding tags & numbers

 
LinkBack Thread Tools
post #1 of 4 (permalink) Old 02-21-2009, 05:37 PM Thread Starter
 
Join Date: Feb 2009
Posts: 2
 
engine decode check me on this!

Guys I bought an engine today that I was told was a 327 and I think it is a 327 by the codes, but some are confusing, check me on this. I am using the 1965-1969 Alan Colvin book for reference.

Engine pad 18S231267 (st louis- pass car)
T0719HH (Tonawanda, July 19,) (HH, no 1968 HH code in my book)
There is a 1969 pass 350/300 hp HH code for HP, turbo 400 application?

engine casting # 3914660 (68 pass 327/275 hp application)
Engine casting date- G8 8 (July 8, 68)

Crankshaft casting 3941174 (book says 327 68-72) but the flange shape at rear end looks like 350 crank flange?
2 bolt mains, not forged.

Heads casting # 3947041 (69 350/300 hp application same as 461 except accessory holes added)
casting date- G13 8 (July 13 1968)

I think it is a 327 except for the crankshaft flange shape, and I can find no HH suffix codes for 68 Pass car. All the casting codes seem to match up as as if all parts were born together. Also since this is a late 68 engine could they have applied the 69 HH suffix to this engine?

What do you guys think? Since this seems to be a very late Pass car engine for the model year. Could the factory have added the 350 application heads as the 327 heads ran out, and the factory might of been starting the 69 350 stuff?

Thanks for any info. JW
bonehead is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 02-21-2009, 09:20 PM
Moderator
 
Join Date: Jan 2006
Posts: 12,456
 
1968 was the first year for the large journal cast crank in 327/307 motors. It would not surprise me that a motor from 1968 had not been rebuilt at least once since then. If they spun a bearing, or just didn't like the cast crank, a forged (or cast) 350 crank may have been used to increase displacement of the smaller 327. If the crank is forged it is indeed a 350 crank for I know of no forged large journal 327 cranks made after 1967.

Big Dave
Big Dave is offline  
post #3 of 4 (permalink) Old 02-22-2009, 06:18 AM Thread Starter
 
Join Date: Feb 2009
Posts: 2
 
No, It is a cast crank, not forged, motor has std pistons in it.

thanks
bonehead is offline  
 
post #4 of 4 (permalink) Old 02-23-2009, 08:07 AM
Moderator
 
Join Date: Jan 2007
Location: Lewisburg, Ohio
Posts: 2,909
 
Block 3914660 = 327-68-2 bolt main
Crank 3941174 = 327-307 cast medium journal 3.25 stroke
Head 3947041 = 69-70 302 327 64cc chamber, accessory holes, good HP head
Check your casting dates on your heads aginst the build date of your car.

http://www.impalas.net/forums/image.php?type=sigpic&userid=521&dateline=14693626  69
dadstoy is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Impala Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

 
For the best viewing experience please update your browser to Google Chrome