Go Back   The Supercar Registry > General Discussion > Supercar/Musclecar Discussion


Reply
 
Thread Tools Display Modes
  #1  
Old 12-13-2017, 04:24 PM
Nasblu's Avatar
Nasblu Nasblu is offline
Senior Member
 
Join Date: Mar 2005
Location: Pennsylvania
Posts: 691
Thanks: 135
Thanked 658 Times in 152 Posts
Default 1970 and 1971 Z28 winters intake letter stamp meaning?

I have noticed on several 1970 Z28 #110 casting intakes and 1971 Z28 #594 casting intakes a letter stamp on the driver side center top of the intake near the base of intake. Was this letter only stamped on intakes used for warranty replacement to denote the month intake was put into service? Example: single letter "J" Would that be J for September? Anyone shed some light on this?
Attached Images
 

Last edited by Nasblu; 12-13-2017 at 04:28 PM.
Reply With Quote
Attachments - The Supercar Registry tn_IMG_7294 (2).JPG s-l1600.jpg
O Garage vBulletin Plugins by Drive Thru Online, Inc.
Click here to view all the pictures posted in this thread...
  #2  
Old 12-13-2017, 04:46 PM
BCreekDave BCreekDave is offline
Senior Member
 
Join Date: Sep 2016
Location: Dayton Ohio
Posts: 863
Thanks: 294
Thanked 410 Times in 227 Posts
Default

Seen this asked before on NastyZ28.
No good answer I have seen. It is on my original intake, but is I think its a number. No correspondence to a date. My guess is that due to it being a stamp and not a casting that it is done post molding and relates to a machining operation. Probably not warranty replacement. I've seen it on too many engines. Unless they replaced many intakes and I think we would have heard about that.
__________________
70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior
Owned since 1978 - First Car
Reply With Quote
The Following User Says Thank You to BCreekDave For This Useful Post:
Nasblu (12-13-2017)
  #3  
Old 12-13-2017, 05:29 PM
Nasblu's Avatar
Nasblu Nasblu is offline
Senior Member
 
Join Date: Mar 2005
Location: Pennsylvania
Posts: 691
Thanks: 135
Thanked 658 Times in 152 Posts
Default

Quote:
Originally Posted by BCreekDave View Post
Seen this asked before on NastyZ28.
No good answer I have seen. It is on my original intake, but is I think its a number. No correspondence to a date. My guess is that due to it being a stamp and not a casting that it is done post molding and relates to a machining operation. Probably not warranty replacement. I've seen it on too many engines. Unless they replaced many intakes and I think we would have heard about that.


That was me asking over at NastyZ28 as well never did get an answer.
Reply With Quote
  #4  
Old 12-13-2017, 05:51 PM
SS427's Avatar
SS427 SS427 is offline
Yenko Contributing Member
 
Join Date: Jul 2001
Location: Pleasant Plains, IL
Posts: 10,137
Thanks: 2,659
Thanked 3,813 Times in 993 Posts
Default

Looking through my photos this is a shot of Mark M's 70 Z28 which was 98% original when I got it and this was stamped on the intake. I blew it up and cannot really make out for sure what it was. An "A" or backwards "4" based on when I blew up the photo. The engine assembly date was 3/11/70 so maybe it is an A? This stamp looks much larger than yours however.
Attached Images
 
__________________
Rick Nelson
Musclecar Restoration and Design, Inc
www.musclecarrestorationanddesign.com
https://www.youtube.com/watch?v=62r-6vgk2_8
specializing in (only real) LS6 Chevelle restorations
Reply With Quote
The Following User Says Thank You to SS427 For This Useful Post:
Nasblu (12-13-2017)
  #5  
Old 12-13-2017, 06:02 PM
Nasblu's Avatar
Nasblu Nasblu is offline
Senior Member
 
Join Date: Mar 2005
Location: Pennsylvania
Posts: 691
Thanks: 135
Thanked 658 Times in 152 Posts
Default

Quote:
Originally Posted by SS427 View Post
Looking through my photos this is a shot of Mark M's 70 Z28 which was 98% original when I got it and this was stamped on the intake. I blew it up and cannot really make out for sure what it was. An "A" or backwards "4" based on when I blew up the photo. The engine assembly date was 3/11/70 so maybe it is an A? This stamp looks much larger than yours however.
I have seen mostly letters by themselves. That appears to be an "A" to me. but I have seen numbers as well. I remember seeing a "70" stamped on a 1970 #110 casting intake. Just trying to determine if there is any correlation between casting date and these stamps?? Just curious why most intakes have nothing yet some have these stamps?
Reply With Quote
  #6  
Old 12-23-2017, 11:53 AM
70 copo 70 copo is offline
Senior Member
 
Join Date: Oct 2000
Location: chillicothe Ohio 45601
Posts: 3,834
Thanks: 219
Thanked 1,231 Times in 576 Posts
Default

That is a GM receipt quality audit stamp. Winters direct shipped so each plant did a quality audit on a segment of each batch of manifolds to verify the contract production specification prior to assembly.
Reply With Quote
The Following 3 Users Say Thank You to 70 copo For This Useful Post:
CamarosRus (12-23-2017), Nasblu (12-23-2017), SS427 (12-23-2017)
  #7  
Old 12-28-2017, 11:36 PM
ANDY M's Avatar
ANDY M ANDY M is offline
Yenko Contributing Member
 
Join Date: Apr 2004
Location: Columbus, OH
Posts: 2,007
Thanks: 56
Thanked 37 Times in 21 Posts
Default

FWIW, "J" would be October. "I" would be September.
__________________

COPO 9561/9737 M40 X11D80
13.37 @ 105.50 on pump gas,drove it to NATL TRAILS and back [email protected] SCR22
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT. The time now is 08:08 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.