Z28 springs - 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 08-05-2007, 09:36 PM
Registered User
Join Date: May 2006
Location: Alaska
Posts: 18
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Z28 springs

I recently bought a set of chevy 2.02 heads and he said that they had Z28 springs on them.. Does anybody know if they are good springs or not??

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 08-05-2007, 10:06 PM
DoubleVision's Avatar
Not Considered a Senior Member
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 43
Posts: 10,733
Wiki Edits: 0

Thanks: 19
Thanked 77 Times in 71 Posts
The Z/28 springs are the same ones that came on the 1967-69 Z/28`s that had a duntov solid lifter 30/30 cam. These springs will work on quite a variety of flat tappet cams be they solid or hydraulic lift. But of course, when lifts and durations get higher than the spring can handle, it needs to have the correct springs. If I remember correctly the 30/30 cam had .485 lift, so a cam up to .485 lift should be okay, as long as it`s not a roller cam. Roller cams require a much more aggressive spring and should always be matched to what the manufactuer recommends. However, some cams today in the flat tappet line have maxed out ramps, and even if there lift falls under the Z/28`s springs max, it could cause issues. I would ask my machinist to be sure if in doubt.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-06-2007, 12:08 AM
techinspector1's Avatar
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Zephyrhills, Florida, USA
Age: 75
Posts: 15,460
Wiki Edits: 326

Thanks: 1,548
Thanked 2,082 Times in 1,611 Posts
"he said"
You may not have enough experience on this rock to know this yet, but I'm gonna upgrade you a little. TRUST NOBODY.

It doesn't matter at all if they are or are not Z28 or XZY-1073 or doodly-squat springs. What matters is like DV said, are they going to match the cam and intended performance of the vehicle you are going to use them in. Follow DV's advice. Disassemble the heads and have a machinist test them for total lift capability before coil bind, on-seat pressure and pressure at the max lift of the valve with the cam you're going to use.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-06-2007, 10:57 PM
Last photo:
Join Date: May 2003
Location: Shreveport LA
Age: 67
Posts: 5,106
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
This is how much to trust advertisers. The original factory Z-28 302's used the same valve springs as the 2-bbl 307's and 350's (pn 3911068). The ones who advertise "Z-28 springs" seem to be trying to mimic the specs of the factory "off-road" springs (pn 3927142) that were designed to be used with the "off-road" camshaft (pn 3927140), neither of which were actual production items.

So basically you could have bone-stock grandpa-motor valve springs, and they wouldn't actually be lying.

Do like DV & TI said and have them checked for sure.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
Leaf Springs... 65comet Suspension - Brakes - Steering 2 05-27-2007 01:21 PM
Consequences of wrong springs on my heads? TVR383 Engine 6 11-23-2005 10:25 PM
Diffrent Springs? strikingthematch Engine 3 12-09-2004 09:12 PM
Valve Springs GearHead69 Engine 5 07-19-2003 11:00 AM

All times are GMT -6. The time now is 09:04 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.