Go Back   The Supercar Registry > General Discussion > Technical & Restoration


Reply
 
Thread Tools Display Modes
  #1  
Old 10-08-2021, 09:56 PM
SuperNovaSS SuperNovaSS is offline
Yenko Contributing Member
 
Join Date: Sep 2001
Location: Santa Cruz, CA
Posts: 6,460
Thanks: 316
Thanked 619 Times in 323 Posts
Default Interesting GM Aluminum Heads Experimental/Prototype Big Block Chevy

I recently picked up this pair of factory Big Block Chevy aluminum heads that came out of an estate. One head is casting number 334112 and the other has the 3946074 casting as well as the casting 0334112 as shown. The wife of the gentleman that passed away said her husband called these his "cheater" heads. The look the same as 3946074 heads to me other than the combustion chambers being slightly different. I imagine the combustion chambers were smoothed and has the exhaust unshrouded after they left GM. Has anyone ever seen this casting number before?


Thanks,


Jason
Attached Images
              
Reply With Quote
Attachments - The Supercar Registry PA080464.JPG PA080460.JPG PA080459.JPG PA080458.JPG
O Garage vBulletin Plugins by Drive Thru Online, Inc.
Click here to view all the pictures posted in this thread...
  #2  
Old 10-09-2021, 01:59 AM
1971ls6's Avatar
1971ls6 1971ls6 is offline
Senior Member
 
Join Date: Mar 2011
Location: Michigan
Posts: 190
Thanks: 15
Thanked 75 Times in 51 Posts
Default

What is the casting date of the 074 head? A part number starting in 0 is experimental. What is that date?
__________________
1969 ZL1 COPO Camaro 11.60@120 F.A.S.T 21
1971 LS6 vette 12.20 @118 PSMCDR
Reply With Quote
  #3  
Old 10-09-2021, 02:09 AM
Lee Stewart's Avatar
Lee Stewart Lee Stewart is offline
Senior Member
 
Join Date: Mar 2017
Location: ABQ, New Mexico
Posts: 36,633
Thanks: 3,506
Thanked 136,486 Times in 22,778 Posts
Default

3946074: ’69 rectangular port, open chamber, 2.19- and 1.88-inch valves, aluminum. Used on 427ci L88 and ZL1 engines.

3946074: ’71 rectangular port, open chamber, 2.19- and 1.88-inch valves, aluminum. Used on 454ci LS6 engines.

https://www.chevyhardcore.com/tech-s...-head-id-0219/
Reply With Quote
  #4  
Old 10-09-2021, 02:43 AM
SuperNovaSS SuperNovaSS is offline
Yenko Contributing Member
 
Join Date: Sep 2001
Location: Santa Cruz, CA
Posts: 6,460
Thanks: 316
Thanked 619 Times in 323 Posts
Default

Thanks for the replies. The head with the 3946074 and the 0334112 casting looks to be 11/17/67.

Jason
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 08:43 PM.


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