after market valve covers - 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 06-21-2003, 07:39 PM
Registered User
 
Join Date: Jun 2003
Location: Cape May, N.J.
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
after market valve covers

Hello- I'm a new guy and fairly new to the engine world. I rebuilt a 401 nailhead for my 64 Buick Wildcat convertible and now I want to start doing a little customizing. This is a very basic question but, I joined this group in order to learn not teach so, here it is- I want to get a set of finned valve covers but I am running across a lot of covers that provide no hole for the pcv that my engine has as original. I see alot of rods out there that have pcv in them and a lot that don't have them. Does an aftermarket breather work just as well as the valve or should I stick with the valve as ususal? Do any of you buy covers and then have them machined to put a valve hole in them so you can use the pcv? The covers I was interested in are Moon finned covers but, the onley way I can make them work with the valve is to machine them and I can't see doing that after paying $200 bucks for them out of the box. Any suggestions would be great, thanks.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-21-2003, 07:52 PM
BOBCRMAN@aol.com's Avatar
Member
 
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 8,130
Wiki Edits: 0

Thanks: 25
Thanked 267 Times in 250 Posts
On a nailhead Buick you can place the pcv valve in the valley cover this will let you run the finned valve covers uncut.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-21-2003, 07:59 PM
Member
 
Last photo:
Join Date: Jun 2003
Posts: 88
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I might not be much of help, but I pulled out a valve cover catalog, and a lot of them that aren't specialized have a caption beside them that say, "drill your own breather/filler cap openings". I have no experience Nailheads unfortunately, but I see some finned nailhead valvecovers on www.speedwaymotors.com; maybe they have the original pcv valve. I would definitely recommend keeping the motor as original as possible, though. Hope I've been some help.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-21-2003, 08:06 PM
willys36@aol.com's Avatar
Hotrodders.com Moderator
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,387
Wiki Edits: 21

Thanks: 1
Thanked 4 Times in 4 Posts
You are confusing the function of the breather and the PCV valve. An engine bottom breathes in and out and you need some way to allow fresh, clean air in because there is occasionally a vacuum created which is what the breather is there for. It has an internal screen to keep out dirt but lets air in. More importantly, you need to have a place for pressure to escape because there is a lot of gasses entering the engine cavity from the combustion process. You don't want to depend on the breather to do this 'cause there is a fair amount of oil in the vapors and it really messes up the engine compartment. Until the environmental awareness came along in the 60s, engines just had a 'road tubeí; a 1 1/2" piece of tubing that connected to the engine lifter valley and extended down to below the engine near the road thus the name. Engine internal gasses were allowed to vent at will.

The PCV valve replaced the road tube and hooks the engine internals to the vacuum in the intake manifold and positively removes the vapors cleanly. Makeup air is let in by the breather so the 'air' inside the engine is much cleaner than the old days. Minor benefit is that the unburned hydrocarbons that used to be blown to the atmosphere are burned in your engine as fuel. PCVs are really a good idea all-round.

You have a few options. First, find a set of valve covers that have the necessary holes. Second, you might need to drill the valve covers for the valve. Put it in the valve cover opposite the breather so there is 'flow thru ventilation'. One final option is to put the PCV valve in the engine lifter valley if it has one separate from the intake manifold. Chevys donít' but early Chrysler hemis do - I don't know about Buicks.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-21-2003, 08:14 PM
Member
 
Last photo:
Join Date: Jun 2003
Posts: 88
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Jesus, I knew I shouldn't have even tried that one. lol.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-21-2003, 09:00 PM
Registered User
 
Join Date: Jun 2003
Location: Cape May, N.J.
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Hey guys-Thanks for the quick info. I'll keep looking for what I need but I pretty much made my mind up to keep the pcv and I am now glad I did. What threw me about breathers is the fact that I look at alot of engines at car shows and I see breathers on alot of them, sometimes on both valve covers. I guess not being familiar with the requirements of each engine doesn't help either. I did not know the valley cover could be an area to place the pcv, maybe I have to look harder at some of the iron out there. I have a factory breather on the oil fill cap which is opposite the pcv. Thanks again.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-22-2003, 07:43 AM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
On my SBC 383 I wanted the pre'68 look but had a newer block. In one of the car mags (wish I could find it again), it showed how to drill and tap a hole in the rear of the block, into the lifter valley. You can then screw in a 90 degree fitting to clear the firewall and run a hose to the air cleaner (for intake air). I then ran a Corvette style oil filler tube with a screw-in PCV valve to the carb. Works like a charm.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-22-2003, 01:56 PM
willys36@aol.com's Avatar
Hotrodders.com Moderator
 
Last wiki edit: How to rebuild a Rochester Quadrajet 4MV carbureto...
Last journal entry: How to change auto shift timing on 200R4
Last photo:
Join Date: May 2002
Location: Bakersfield
Posts: 8,387
Wiki Edits: 21

Thanks: 1
Thanked 4 Times in 4 Posts
Quote:
Originally posted by MI2600
On my SBC 383 I wanted the pre'68 look but had a newer block. In one of the car mags (wish I could find it again), it showed how to drill and tap a hole in the rear of the block, into the lifter valley. You can then screw in a 90 degree fitting to clear the firewall and run a hose to the air cleaner (for intake air). I then ran a Corvette style oil filler tube with a screw-in PCV valve to the carb. Works like a charm.
Bingo! Classic hot rodder's solution to a task that "can't be done".
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 08:58 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.