International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > General FSJ Tech

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 09-14-2010, 02:19 PM
AKAMC's Avatar
AKAMC AKAMC is offline
Gear Head
 
Join Date: Sep 23, 2006
Location: Lebanon Oregon
Posts: 589
Head casting 3231475-2 questions

I picked up a pair of heads a few weeks ago from a guy who knew little about them or what was done to them. There head casting number 3231475-2 which I beleave is originally a 78 360/401 casting. However these have had alot of work done to them. I measured the valves across the diameter in the chamber and came up with 1.87 intake and 1.59 exhaust. Are these some type of SBC valves? Casting numbers show these heads as 360 heads so should have had bigger valves originaly. A slip of paper I found stuffed into the intake port said 71 304 head with SBC valves. They are set up for screw in studs as well. Ports have been pollished and chamber smoothed out alot too.

What puzzles me is I would think to install smaller SBC valves these heads would have had to have new smaller seats pressed into them. I can see no evidence of this but I don't have a way to compress the valves to look closly either. Am I measuring the valves diameter correctly? Could these actually be 71 304 heads with the smaller 304 valves? I'm guessing not and they were 360 heads built with smaller SBC valves, but larger then standare 304, to run on a 304.

I'm looking at a 401 that I might want to run these on but would want to install the 360/401 valves into them. Can that be done on these castings if they infact have smaller seats for the smaller SBC valves?

Thanks for any info or suggestions...
__________________
06 Rubicon Wifes toy
84 CJ8
66 Amphicar Yea it's a boat too!
08 German Sheperd
03 Golden Retriever
06 Golden Retriever
19XX Sexy Red Head loaded with all the options!

ALASKA... "Land of the Individual and Other Endangered Species"
Reply With Quote
  #2  
Old 09-14-2010, 06:26 PM
Elliott's Avatar
Elliott Elliott is offline
Cowboy Up
 
Join Date: Jun 22, 2002
Location: Pilot Point, TX
Posts: 12,704
Should have bigger valves... 2.025 & 1.680

My guess is you aren't measuring correctly. Why anyone would put lame valves in a AMC is beyond me.... Take the best flowing production heads and restrict them to GM standards? Why?





__________________
*** I am collecting pics and info on any factory Jeep Dually trucks from the J-Series at the new Jeep Dually Registry.
***I can set you up with hydroboost for your brakes: http://www.ifsja.org/forums/vb/showthread.php?t=106056

Last edited by Elliott : 09-14-2010 at 06:33 PM.
Reply With Quote
  #3  
Old 09-14-2010, 06:34 PM
AKAMC's Avatar
AKAMC AKAMC is offline
Gear Head
 
Join Date: Sep 23, 2006
Location: Lebanon Oregon
Posts: 589
Yea thats the chart I used. The head should be a 78 360 head according to that. Just wondering about the smaller valves it has in it and the screw in studs it's set up for...
__________________
06 Rubicon Wifes toy
84 CJ8
66 Amphicar Yea it's a boat too!
08 German Sheperd
03 Golden Retriever
06 Golden Retriever
19XX Sexy Red Head loaded with all the options!

ALASKA... "Land of the Individual and Other Endangered Species"
Reply With Quote
  #4  
Old 09-14-2010, 06:40 PM
Elliott's Avatar
Elliott Elliott is offline
Cowboy Up
 
Join Date: Jun 22, 2002
Location: Pilot Point, TX
Posts: 12,704
Are you measuring total diameter of the valve?

http://gsi.xw.gm.com/image_en_us/gif...663/663532.gif
__________________
*** I am collecting pics and info on any factory Jeep Dually trucks from the J-Series at the new Jeep Dually Registry.
***I can set you up with hydroboost for your brakes: http://www.ifsja.org/forums/vb/showthread.php?t=106056
Reply With Quote
  #5  
Old 09-14-2010, 06:48 PM
AKAMC's Avatar
AKAMC AKAMC is offline
Gear Head
 
Join Date: Sep 23, 2006
Location: Lebanon Oregon
Posts: 589
Yea the valves are in the heads with springs holding them shut. Uing a 6" caliper across the widest part.
Quote:
Originally Posted by Elliott
Are you measuring total diameter of the valve?

http://gsi.xw.gm.com/image_en_us/gif...663/663532.gif
__________________
06 Rubicon Wifes toy
84 CJ8
66 Amphicar Yea it's a boat too!
08 German Sheperd
03 Golden Retriever
06 Golden Retriever
19XX Sexy Red Head loaded with all the options!

ALASKA... "Land of the Individual and Other Endangered Species"
Reply With Quote
  #6  
Old 09-14-2010, 06:51 PM
AKAMC's Avatar
AKAMC AKAMC is offline
Gear Head
 
Join Date: Sep 23, 2006
Location: Lebanon Oregon
Posts: 589
Quote:
Originally Posted by Elliott
My guess is you aren't measuring correctly. Why anyone would put lame valves in a AMC is beyond me.... Take the best flowing production heads and restrict them to GM standards? Why?
I'm thinking maybe the builder intended to use them on a 304. Started with the larger valve heads thinking they flowed better then a standared 304 head maybe? And ported then even more. I posted awhile abck about using 360 heads on a 304 and most said it wouldn't work out well. SO I was thinking this was what people did for a hot 304 maybe?
__________________
06 Rubicon Wifes toy
84 CJ8
66 Amphicar Yea it's a boat too!
08 German Sheperd
03 Golden Retriever
06 Golden Retriever
19XX Sexy Red Head loaded with all the options!

ALASKA... "Land of the Individual and Other Endangered Species"
Reply With Quote
  #7  
Old 09-14-2010, 06:59 PM
Elliott's Avatar
Elliott Elliott is offline
Cowboy Up
 
Join Date: Jun 22, 2002
Location: Pilot Point, TX
Posts: 12,704
Seems like a waste of time. I don't think there ever was a shortage of 304 heads. I guess he was fixing to do the seats anyway so just grabbed what they had.
__________________
*** I am collecting pics and info on any factory Jeep Dually trucks from the J-Series at the new Jeep Dually Registry.
***I can set you up with hydroboost for your brakes: http://www.ifsja.org/forums/vb/showthread.php?t=106056
Reply With Quote
  #8  
Old 09-14-2010, 07:02 PM
AKAMC's Avatar
AKAMC AKAMC is offline
Gear Head
 
Join Date: Sep 23, 2006
Location: Lebanon Oregon
Posts: 589
Quote:
Originally Posted by Elliott
Seems like a waste of time. I don't think there ever was a shortage of 304 heads. I guess he was fixing to do the seats anyway so just grabbed what they had.
I agree... Thats why I'd want to install the larger valves if I can...
__________________
06 Rubicon Wifes toy
84 CJ8
66 Amphicar Yea it's a boat too!
08 German Sheperd
03 Golden Retriever
06 Golden Retriever
19XX Sexy Red Head loaded with all the options!

ALASKA... "Land of the Individual and Other Endangered Species"
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
258/T176 trans and head questions 2Stock General FSJ Tech 1 10-05-2009 01:30 PM
pulled head and found.... bockslanding Off-Road FSJ Tech 19 02-11-2009 03:57 PM
Swapped the 4.0 head saturday jeepjerry General FSJ Tech 0 12-07-2008 10:33 PM
gear head questions maccj5 General FSJ Tech 4 10-24-2008 07:56 AM
Engine final assembly questions JeepsAndGuns General FSJ Tech 29 08-02-2005 02:31 PM


All times are GMT -6. The time now is 08:38 AM.


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
corner corner