Help with Head / Valve Spring selection - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board -- 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
  #16 (permalink)  
Old 01-21-2011, 09:55 AM
Registered User
Join Date: Jun 2010
Location: TX
Posts: 1,212
Wiki Edits: 0

Thanks: 0
Thanked 108 Times in 99 Posts
Valve train

You can use the same set up that I have on my 1991 Chevy 4.3L V6 engine. I research the set up with my engine builder extensively and it works as I expected. My camshaft is a Comp Cams roller tappet with .500" valve lift.

Ferrea F5001, 1.94" intake (intake valve seats seldom erode)
Ferrea F5005, 1.60" exhaust (larger exhaust valves will have new seats) ($8/$9 each) undercut stems, stainless steel, 4.910" long with .256" tip.
Note: I assembled one set of heads with 2.02" intake valves but did not use them. I decided the increased intake flow is not necessary below 5500 RPM. Larger intake valves require combustion chamber unshrouding to be effective.

Comp Cams 26981-16 beehive-ovate, 110# @ 1.700", 288# @ .511" lift
lower diameter: 2.400" OD, upper diameter:1.065" OD. Moderate spring rate such as these is for a high performance daily driver using no-lead gasoline.

Comp Cams 795-16, 10 degree, for beehive springs.

Comp Cams 614-16, 10 degree, +.050", use with .060" spring seat locators

Comp Cams 4693-16, .060" thick

Comp Cams 7949-16, 7.300", .080" wall, chromemoly, 5/16" OD, +.010" long. Hydraulic lifter preload adjustment will compensate for up to +/- .050" pushrod length. When using solid roller or solid flat tappet lifters the pushrods must be dead-nuts on.

NOTE: Comp Cams 503-16 valve seals, .530" OD guide, positive stop teflon along with K-line Bronze Bullet phosphor-bronze valve guide liners. Max. stem clearances: .0015" intake, .002" exhaust. Ferrea valve stems do not have groove for O-rings seals therefore it is necessary that positive stop teflon (or viton) seals be used. Virtually no oil gets past those seals. They are "self-lubricating".


Last edited by MouseFink; 01-21-2011 at 10:06 AM. Reason: typo
Reply With Quote Quick reply to this message
Sponsored Links
  #17 (permalink)  
Old 01-21-2011, 02:26 PM
SSedan64's Avatar
Registered User
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
Originally Posted by F-BIRD'88
What does it say on the cam card for installed/seat and open spring pressure?
Calls for 26981 Beehive.
Install Ht.= 110Lbs. @1.700", Open= 292Lbs @1.175", Rate= 347Lbs.

or 26918 Beehive springs.
Install Ht.= 125Lbs. @1.800", Open= 367Lbs. @1.150", Rate= 372Lbs.
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:


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
Flat head Valve spring remover Tool??? pk44 Garage - Tools 4 08-20-2009 09:08 PM
HEI Spring Selection Custom10 Engine 3 05-16-2009 10:39 PM
Valve Spring Replacement, While Head Are On Grouper Engine 2 05-16-2008 07:57 AM
Comp Cams Valve Spring Questions - Selection leejoy Engine 11 11-10-2007 05:42 AM
spring selection bighotroddin Suspension - Brakes - Steering 2 09-03-2003 09:02 AM

All times are GMT -6. The time now is 04:31 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright 1999 - 2012. All Rights Reserved.