Threaded vs Pressed Rocker Studs (SBC) - 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 10-28-2004, 09:45 PM
Member
 
Join Date: Sep 2004
Location: TX
Posts: 34
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Threaded vs Pressed Rocker Studs (SBC)

Threaded vs Pressed Rocker Studs (SBC)

I wondering 'if' or just 'how' beneficial the threaded studs are for an engine such as mine? Older SBC 350 from early 70s, 2 bolt main, iron heads w/ orig pressed in studs, built for low RPM torque - idle-5500, hydr cam, 9:1CR or so.

And if not just what are some good scenarios or rules of thumb for when it does become advisable? I 'think' Chevrolet started installing these originally on certain HP engines like maybe the L82. If so, was it because of power levels? Cam profile? RPMs?

And what about upgrading to a hydraulic roller cam? Not a 'radical' cam but of similar duration/lift to my current HMV260 (Crane).

thanks,

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-29-2004, 04:21 AM
strikingthematch's Avatar
Pure American Muscle
 

Last journal entry: Still Going
Last photo:
Join Date: Mar 2004
Location: VA
Posts: 688
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
In most cases screw in studs are used once you reach a certin high spring pressure such is common with large cam profiles. As for any set spots where you will need it I cannot say for sure. However when you start to getting up there in cam profile the need becomes greater as sometimes you can pull the stud right out of the head and there is a good chance you will be doing some repair work then.


Chris
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-29-2004, 04:27 AM
Muscle car fan
 
Last photo:
Join Date: Mar 2003
Location: Manitoba, Canada
Posts: 864
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
As mentioned higher spring pressures will press on the studs more pulling them out easier. It would be a large guess as to what pressure they would come out at though.
__________________
'74 Gran Torino Project
351W, c6 trans, 9"
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-29-2004, 04:55 AM
roys63's Avatar
Member
 
Last photo:
Join Date: Dec 2001
Location: Nc
Age: 63
Posts: 907
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If you are rebuilding i would have the studs pined on a low budget deal and small lift cams or a stock rebuild. Just cheap insurance, real pain to repair when one pulls or they start pulling.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-29-2004, 06:16 AM
Deuce's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Choosing a trailer
Last journal entry: Jan 13 2013
Last photo:
Join Date: Aug 2002
Location: Deuceland USA
Age: 66
Posts: 5,657
Wiki Edits: 6

Thanks: 0
Thanked 9 Times in 9 Posts




I have ran the Z28 solid lifer camshaft (1969 one) and springs in basically stock SBC's with no problems. I believe the 1970 370 HP 350 was the first SBC with screw in studs from the factory. I know 69 Z28 302's do not ( or my new one did not).

If you have the heads off...........most machine shops can convert yours to screw ins for a reasonable price.

Cheap insurance IMHO.


A hydraulic roller camshaft conversion would help the fuel mileage but would not be cost effective for a lot of miles.

I would just find a later model block that already has the hydraulic roller and build it. They also would have the 1 piece seal rear main.

__________________


"I won't be wronged . I won't be insulted, and I won't be laid a hand on. "






Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-29-2004, 08:48 AM
johnsongrass1's Avatar
Race it, Don't rice it!
 
Last photo:
Join Date: Jul 2002
Location: Columbia, Mo
Age: 37
Posts: 4,080
Wiki Edits: 0

Thanks: 0
Thanked 10 Times in 10 Posts
Scrwein studs are also stronger. They will deflect less than a pressed stud and can hold there valve geometry better. Pulling studs is the first thing to occur with 350 pound spring pressures.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-29-2004, 06:18 PM
roys63's Avatar
Member
 
Last photo:
Join Date: Dec 2001
Location: Nc
Age: 63
Posts: 907
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Screw in studs are the best way to go, pined studs will work just fine they have for years, cost now days about $60 at the most . Machine Work involved to install screw in studs and the cost of the studs, $200 +. I have run up to 488 lift cams with out problem's with just the press ins. This is one way to save some Cash on a low budget rebuild. One problem you can have with the screw in studs is some of the push rods won't line up to the rockers with out binding on the head guide and you have to drill out the head and use guide plates and hardened push rods , Even more machine work and more money in parts!
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 10-29-2004, 07:10 PM
302 Z28's Avatar  
Last photo:
Join Date: May 2003
Location: North Texas
Posts: 10,837
Wiki Edits: 0

Thanks: 1
Thanked 86 Times in 73 Posts
The comment on screw in studs flexing less is right on and screw in studs should be a consideration for any hi po engine. Just take a look at the mounting base of a stock Chevy screw in stud, it's at least twice the surface area of a pressed in stud. The fact that they will not pull out with high spring pressures is an added benefit.

Vince
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 11:32 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.