rookie sbc head question - 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 07-19-2004, 11:48 PM
Registered User
 
Join Date: Jul 2004
Location: sedalia, mo
Age: 37
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
rookie sbc head question

I've got a question about a set of SBC heads. The casting number on the heads I have are 3973487. From doing a search on www.mortec.com I found this..

3973487....71-72....350...used on 71-72 350 LT1, 75cc chamber

my question is does the LT1 mean these came on a performance engine (corvette)?

does anyone know what size the valves are or how can I find out?

Maybe I got lucky and got some good ones.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-19-2004, 11:59 PM
406 ss monte's Avatar
eat a beaver, save a tree
 
Last photo:
Join Date: Dec 2003
Location: greeneville, tn
Age: 43
Posts: 605
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
it just means those cast # heads were used on the lt1. they should have 1.94-1.5 valves. just a plain basic head like 624's, 993's, & 882's. do they have screw in studs?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-20-2004, 01:01 AM
fourbyfourblazer's Avatar
Chopper Builder o<>\o
 

Last journal entry: Dash Removal
Last photo:
Join Date: Jul 2004
Location: Arleta, Ca.
Age: 45
Posts: 172
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
SBC Heads

I thought I recognized those head numbers. I have the 3973487X heads that are 2.02's. Lingenfelter book says that my 487X heads are great flowing. Check out this site for the break down on some of the different head configurations for performance small block chevy heads.

Small Block Chevy Heads

This is what is says about your heads.

LARGE CHAMBER PRODUCTION "ON CAR" HEADS

"487" 3973487, OR 3973487X. The regular casting was found on the 1971-1972 350 LT-1 engines, had 1.94/1.50" valves, 76CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's. The 487X had 2.02/1.60" valves.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-20-2004, 06:15 AM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The 487s are good heavy castings and decent breathers for their age, although they have the larger chambers. I'd definitely keep them.

406 monte: I wouldn't put 624s in the same class as 487s. 624s are even worse than 882s.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-20-2004, 09:56 AM
Registered User
 
Join Date: Jul 2004
Location: sedalia, mo
Age: 37
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
heads

thanks for the input guys. I've been spending lots of time the the garage lately. I've got the bug real bad right now. I love summer.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-03-2005, 11:59 AM
Registered User
 
Join Date: Jul 2005
Location: vt
Posts: 2
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
engine

i too have the 3973487x number. i believe that it comes from a 70-72 camaro. the 70 is pushing 360 hp, 71 is 300hp and the 72 is only 255hp.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-03-2005, 12:16 PM
steve t's Avatar
ex biker, now hotrodder
 
Join Date: Mar 2005
Location: NC
Age: 64
Posts: 863
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
i have 1 487x, and 1, just 487, they should run alright together, shouldn't they????
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 07-06-2005, 07:02 PM
Member
 
Last photo:
Join Date: May 2003
Location: Shreveport LA
Age: 64
Posts: 5,103
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by andymorganelli65@hot
i too have the 3973487x number. i believe that it comes from a 70-72 camaro. the 70 is pushing 360 hp, 71 is 300hp and the 72 is only 255hp.
The '71 is GROSS HP, and the '72 is NET HP. Same engine, different rating method.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-06-2005, 08:27 PM
HemmiGremmie's Avatar  

Last journal entry: 52 truck
Last photo:
Join Date: May 2002
Location: Chillicothe Ohio
Age: 47
Posts: 1,406
Wiki Edits: 0

Thanks: 3
Thanked 0 Times in 0 Posts
The X heads are good ones.
Unless your wanting every horse outta your motor, use em. HG
__________________
I was built with the body of a God! To bad it was buddah.

[url]http://www.hotrodders.com/forum/journal.php?action=view&journalid=2415[/url]

Hemmies rat journal below.

[url]http://www.hotrodders.com/forum/journal.php?s=f6d0e9c7fec644bb0a70761c0431939b&journalid=84231&action=view[/url]
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 02-08-2009, 08:33 PM
Registered User
 
Join Date: Jan 2009
Location: illinois
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
487x

i have a set of 487x heads on my 355 and they did not have 202/160 valves.they do not have screw in studs.i left the valves,no port work or gasket match and installed 3/8 studs and flat tops and 268xe cam.motor made 297 hp at rear wheel with 3.42 gears.ran a best of 13.45 at 109 in quarter.good heads should get 400hp with bigger cam and some port work.
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



All times are GMT -6. The time now is 12:19 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.