Springs for Vortec Heads - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old Oct 17th, 05, 11:30 AM Thread Starter
Senior Tech
Andy
 
Join Date: Jul 2005
Location: Northeast,GA
Posts: 1,398
Send a message via AIM to 67SS&99SS
Question Springs for Vortec Heads

What springs do I need to put in my vortec heads to accomodate the comp cams xe274 cam with 1.6 pro magnum roller rockers? I calculated the lift to be around .519/.522. Would the LT4 valve springs(GM Part #12495494) work without machine work to the heads? Also, if I put screw in studs in the heads, I won't have to run the self-aligning rockers, right?

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
67SS&99SS is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old Oct 17th, 05, 01:59 PM
Gold Lifetime Member
John
 
Vintage 68's Avatar
 
Join Date: Mar 2002
Location: Moraga,Ca.,USA
Posts: 13,705
Re: Springs for Vortec Heads

1.) Check out the Crane Cams Kit #10309-1 for Vortec Heads. The kit will install without machining the seat.
Lift can be up to 0.550" if you use stock GM retainers and @0.525" if you use Crane's retainers. (edit ...)

2.) No, use of the GM kit requires machining the seat and guide boss.
You can get the tools from Summit, Crane or Comp.

3.) Wrong The 3/8" screw in studs will prevent the pull-out issues associated with the factory pressed-in studs - BUT, you will still have to use 'self-aligning' rockers or you can use the Guide-plates sold by several sources for Vortec applications (with the screw-in studs).

Hope this helps;
John

1968 Convertible
Some trucks
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V8 things - some of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Other V6 things - none of which float
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Oh yeah, and 1 "Straight-Six" ...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Vintage 68; Oct 18th, 05 at 11:25 AM. Reason: spelling... "retains" = retainers...
Vintage 68 is offline  
post #3 of 5 (permalink) Old Oct 17th, 05, 08:11 PM Thread Starter
Senior Tech
Andy
 
Join Date: Jul 2005
Location: Northeast,GA
Posts: 1,398
Send a message via AIM to 67SS&99SS
Re: Springs for Vortec Heads

Thanks for your help John.

1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
67SS&99SS is offline  
 
post #4 of 5 (permalink) Old Oct 18th, 05, 12:56 AM
Senior Tech
Chris
 
Join Date: Jun 2005
Location: Wichita Falls, Texas
Posts: 537
Cool Re: Springs for Vortec Heads

The guide boss must be machined on Vortech heads FOR HIGH LIFT CAMS or oil seal to retainer contact will happen above about .470 - .480 lift or so. THE HEADS HAVE TO BE DISASSEMBLED AND MACHINED FOR GUIDE BOSS HEIGHT AND FOR POSITIVE SEALS! Many guys have tried to short cut this and two things happen - broken valve springs and cut valve stem seals.

1967 Chevelle 496BB/TH400/Dana-60 (Show and Go)
1967 El Camino 388SB/700R4/12-bolt posi (Daily Driver)
1967 C10 Short-Wide 496BB/TH400/12-bolt (The Shop Truck)
2008 Harley Davidson Dyna Low Rider


Chris @
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Motorhead62 is offline  
post #5 of 5 (permalink) Old Oct 18th, 05, 07:36 PM
Gold Lifetime Member
Don
 
Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Posts: 11,154
Re: Springs for Vortec Heads

If you are going to that extent of dismantling the heads to do it correctly, might as well do it all the way, Machine spring pockets to allow a large enuff spring that will last you a long time and not more problems . If you use guide plates then self align rockers are not needed and vice versa the other way, Use guide plates ,, use good heat treated stuff. If you use the large rollers , might consider heavier springs to handle the hi rpm stuff if not use hyda rev kit.

Don
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
zdld17 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
GM BB Heads, Open or Closed?? My 72 Performance 6 May 11th, 05 11:28 AM
Need info about vortec heads big lubowski Performance 7 Oct 12th, 03 05:24 PM
SR TORKER HEADS AND STOCK HEADS KEVY G Tech 2000 8 Apr 6th, 01 06:34 PM
cylinder heads boodlefoof Engine 27 Mar 1st, 01 03:10 AM
Heads, Heads, and more Heads??? Johnny Fry Performance 11 Feb 5th, 00 12:01 PM

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

 
For the best viewing experience please update your browser to Google Chrome