will lash caps fix this problem? - 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 05-12-2010, 10:59 PM
wyomingoutlaw's Avatar
Registered User
Join Date: Jan 2007
Location: montana
Posts: 37
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
will lash caps fix this problem?

I had a machine shop do my heads, and they installed dual valve springs. everything is great except the new retainers are dished. this is causing the rocker arm to rest on the side of the retainer and not on the valve, and when the cam begins to lift, the rocker arm pushes down on the side of the retainer until the retainer moves down and out of the way. if I use a longer pushrod, the rocker arm rests on the valve stem like it should, and pushes on the valve like it should, but the rocker arm runs out of travel and everything binds.

I've considered grinding some relief on the bottom of the rocker arms to clear the retainers, or opening up the slot on rocker arms to allow more travel, but the thought of taking a grinder to my new roller rockers kinda makes me sick... so I've been researching this problem and just came across lash caps. this is ther first I've ever heard of them and I don't know how I missed these things, but, what exactly are they, how do you install them, what keeps them on and finally, would they fix my problem?

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 05-12-2010, 11:22 PM
ericnova72's Avatar
More for Less Racer
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 50
Posts: 13,253
Wiki Edits: 0

Thanks: 140
Thanked 1,759 Times in 1,492 Posts
Lash caps could fix your problem with clearance, but you may need to get a longer rocker stud so that you don't run out of thread. ARP sells several different lengths of studs.

The lash cap will require you to have keepers that are machined for clearance for the lash cap's lip, and I think they have to be 10 keepers and retainers, I have never seen keepers machined for lash caps in 7. The lash cap CANNOT touch the keepers. If the valvestem tip is long enough to keep the cap off the keepers then it is fine regardless of keeper degree angle.

The lash cap looks just like a bottle cap, made of steel. the cap sits on the valvestem tip, it is kept in place by its inability to fit out of position through the valve lash clearance, kept in place by the rocker arm, just lke the arm keeps the pushrod and lifters in place. Run about $35 a set. Commonly .060-.080" thick above the valvestem.

Lash caps may require you to use a longer pushrod to maintain correct rocker arm geometry. You have been checking the geometry too, haven't you?? Sounds like in your case the longer pushrod really messes with the goemetry right now if the arm runs out of travel using it, but it might be correct once a lash cap is in place. Just a guess right now is that it will still be .050" too long even with a cap.

The only other fix would be to grind the rocker arm body for clearance, this gets done alot but I'm like you, don't like to do it if there is another way.

You could also get different height retainers if you have room to take some shim out from under the spring, but if there is no shim or not enough shim that won't work either.
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
Older Holley 4150 and 700R-4 TV Cable Problem Solved -- Maybe hduff Transmission - Rearend 5 08-20-2016 05:08 PM
Aluminum Heads scenario of potential problem of cause of oil consumption (long) y2k600f4 Engine 37 09-14-2009 05:22 PM
Steering Lash Adjustment Problem GCD1962 Suspension - Brakes - Steering 1 12-30-2005 08:23 AM
Valve lash caps lluciano77 Engine 5 10-22-2003 05:49 AM
Fuel / Carb problem DoubleVision Engine 5 10-28-2002 05:18 PM

All times are GMT -6. The time now is 01:55 PM.

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.