Identification on a lt1 camshaft? - 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 06-13-2007, 03:16 PM
Registered User
 
Join Date: Jun 2007
Location: Sweden
Posts: 28
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Identification on a lt1 camshaft?

Have a camshaft in my garage and would like to now how i can see if its a lt1 cam.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-13-2007, 03:35 PM
Bumpstick's Avatar
Hammer and a torch
 
Last photo:
Join Date: May 2003
Location: Southeast TX
Age: 53
Posts: 1,258
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
As in lt1 (1970 era) or lt1 reverse flow cooling...? Also kinda need the number...
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-13-2007, 03:41 PM
Registered User
 
Join Date: Jun 2007
Location: Sweden
Posts: 28
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
1970 what number
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-13-2007, 04:46 PM
On the learning curve.
 
Join Date: Feb 2007
Location: Nova Scotia
Posts: 236
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
There should be a number on the end of the cam. Mine was on the distributor end. Mine was "179R", just to give you a hint of the number to look for.

Steve
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-14-2007, 02:11 AM
Registered User
 
Join Date: Jun 2007
Location: Sweden
Posts: 28
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
There is no number on the end of the cam.Here comes all number on the cam:CMC,CWC,D1,C1,E,21,1.5,539,Its a yellow and red spot at the end of the cam.I do not think this is a original LT1 camshaft,maybe a copy of it.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-14-2007, 08:26 AM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Pittsburgh, PA
Age: 40
Posts: 5,128
Wiki Edits: 16

Thanks: 0
Thanked 2 Times in 2 Posts
You can purchase a cam timing kit from a performance parts store. I'm not sure if Summitracing.com ships overseas but they have them. Then you can just follow the instructions and find out exactly what cam you have. It will tell you lift, duration, and separation angle with a little adding and subtracting. Its a pain and it takes a while, but its one way of finding out exactly what cam you have.

I don't know about over there, but here cams are cheap. You could just figure out which one you want and get a new one.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-14-2007, 08:55 AM
Registered User
 
Join Date: Jun 2007
Location: Sweden
Posts: 28
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Its expensive in sweden,but,summit can send cams to sweden.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-14-2007, 02:19 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,448
Wiki Edits: 0

Thanks: 2
Thanked 320 Times in 317 Posts
You can verify the cam lobe lift using a a dial caliper to check the major diameter and minor diameter of the cam lobe. Subtract the minor diameter form the major diameter to get camshaft lobe lift.
A 1970 350/360hp-370hp "Z-28" -- "LT-1" cam will have a .485" valve lift. the lobe lift will be .3233"
In late 1970 and all 1971-1972 the 350-LT-1 cam was revised with a new shorter intake duration less intake lobe lift. This intake lobe is .459" at the valve. the lobe lift is .306" the exhaust lobe is unchanged.

Cam specs for the early LT1 cam are 254-254@.050" 114LSA .485"-.485" valve lift .030" hot valve lash.
The later, revised LT-1 cam used in late 1970 to 1972 is 242-254deg @.050" .459"-.485" .024-.028" hot lash 116 LSA
Both these cam need a high stall (3500) torque converter, 9.5:1 minimum cr ( they were designed for 11:1 cr or more) and high ratio gears (4.10 or higher)
Both cams need a aggressive recurved ignition advance curve with much more initial timing than a stock distributor has.
Neither of these cams will like a OD transmission or stock stall converter or stock low ratio gearing. If you have nay of these pick a different camshaft.
the usable rpm range of the early cam is 4000 to 6800 rpm. the later dual pattern cam with shorter intake duration like a 3000 to 6400rpm power range.
both need free breathing high performance cylinder heads to work.
Littel 283 heads with tiny tiny valves is not going to cut it.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 06-14-2007, 03:42 PM
Registered User
 
Join Date: Jun 2007
Location: Sweden
Posts: 28
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Okey,gonna look up that,or else gonna buy another cam,its not so very expensive.Is a 300hp cam from a 327 any good to have whit my heads, :3795896 60cc (327 hp) on a 350 orginal block (1987)
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 06-14-2007, 04:01 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,448
Wiki Edits: 0

Thanks: 2
Thanked 320 Times in 317 Posts
The 327-300hp cam is a mild low rpm smooth idle "stock Cam" specs are 195-202@.050" .390-.410" lift 112lsa. Usable power band is idle to 4500rpm.
The little small valve 283 heads will restrict the engines power out put reguardless of the cam used.
The engine will run fine just don't expect to beat anyone in a race.

All the heads you are asking about are low performance smog heads.
If you are on a strict budget find some 416 casting 305 heads and rework them for high performance with larger 1.94 x1.60" valves and lots of home porting.
When properly modified these cheap heads give great street performance for low $$$. They also have hardened exhaust seats for unleaded gas and accessory bolt holes on the ends for the alternator brackets etc.
The old 283 heads do not.
Pick the camshaft based on the rear gear ratio of the car its going in.
Long duration rough idle cams like lots of rpm need a high rear gear ratio.
If your car does not have high ratio gears use a moderate midrange torquey hyd lifter cam with 218deg or less ".050" duration" and about .440"-.480" lift.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
camshaft identification help yodert75 Engine 2 11-19-2006 01:31 AM
LT1 Camshaft goldenrog Engine 2 01-31-2006 09:27 PM
Identification of my Erson mechanical camshaft regens sum Engine 2 06-03-2004 03:23 PM
Camshaft identification help frog454 Engine 2 02-11-2003 05:31 PM
Camshaft identification 56classic Engine 1 09-22-2002 02:39 PM


All times are GMT -6. The time now is 06:49 AM.


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.