Valve to piston clearance - 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 07-24-2003, 06:21 PM
Stinky's Avatar
Suspended
 
Join Date: Jun 2003
Location: St. Louis, MO
Age: 36
Posts: 128
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Valve to piston clearance

I have a 69' Pontiac 400 with A/T, A/C
The heads are stock.
I put a cam in with lift at valve: Intake .420"
Exhaust .442"
The stock valve lift is: Intake .410"
Exhaust .413"
My question is will this setup work with using stock heads??
( I havent the I.D. numbers on the heads)

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-24-2003, 07:04 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 59 Times in 56 Posts
it should be just fine, I wouldn`t worry about a step bigger cam running into any problems.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-24-2003, 07:19 PM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 37
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Re: Valve to piston clearance

Quote:
Originally posted by Stinky
I have a 69' Pontiac 400 with A/T, A/C
The heads are stock.
I put a cam in with lift at valve: Intake .420"
Exhaust .442"
The stock valve lift is: Intake .410"
Exhaust .413"
My question is will this setup work with using stock heads??
( I havent the I.D. numbers on the heads)
I think you are safe to at least .480" lift on a Pontiac 400. A lot of times the springs are worn out on rebuilt heads. If you want you can always change the valvesprings. This would be for reliability not because of clearance, and get a spring rated for .500" lift. They should be pretty cheap.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-24-2003, 07:44 PM
4 Jaw Chuck's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 46
Posts: 4,974
Wiki Edits: 0

Thanks: 2
Thanked 89 Times in 72 Posts
If you put it in already you would know? Wouldn't you? Is it running already?
__________________
Outlawed tunes from outlawed pipes
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-24-2003, 07:50 PM
dmorris1200's Avatar
doesn't play well with others
 
Last photo:
Join Date: Feb 2002
Location: Maine
Age: 49
Posts: 1,834
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally posted by 4 Jaw Chuck
If you put it in already you would know? Wouldn't you? Is it running already?
Good point Chuck.

__________________
BUILT FORD TOUGH
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-24-2003, 08:03 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally posted by 4 Jaw Chuck
If you put it in already you would know? Wouldn't you? Is it running already?
Maybe he hasn't fired it up yet. Anyway, the cam he has isn't much more than stock , but I will say this about a Pontiac, the factory springs are weak, and they only install around 1.600" so they don't tolerate alot of valve lift, and even if they don't coil bind, you won't have much spring pressure which means you won't be able to twist it very tight before valve float occurs. I recommend a spring upgrade with any type of performance Pontiac cam.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-24-2003, 08:18 PM
dmorris1200's Avatar
doesn't play well with others
 
Last photo:
Join Date: Feb 2002
Location: Maine
Age: 49
Posts: 1,834
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Just havin' a little fun there Nairb. I'm sure Chuck thought the same thing I did after reading his post. Wouldn't most people check to see if a cam would work in their engine before they (A) bought it, and (B) installed it? Either way I thought it was kinda funny.

__________________
BUILT FORD TOUGH
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 07-24-2003, 09:31 PM
Stinky's Avatar
Suspended
 
Join Date: Jun 2003
Location: St. Louis, MO
Age: 36
Posts: 128
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I did replace all the springs with the performance stock type and put in new seals. Just trying not to get any surprises, covering all the bases.
Be gone, this board is for technical help. The next time you land youre getting swatted.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-24-2003, 09:38 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
VALVE TO PISTON CLEARANCE

Stinky, it's always a good idea to mock up your engine and "clay up" a cylinder just for safety's sake. With the cam you have selected, you should be just fine. However, for your own peace of mind, mock up one cylinder head, put some clay on one piston and get ahold of one solid lifter to cycle your cam through it's lift cycle, then measure (if any) how much your clay was squashed. As noted before, you should be fine and dandy with your mild cam.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 07-24-2003, 10:24 PM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 37
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Yeah, and don't forget to check your oil pressure before you start your engine! Sorry Stinky I'll leave that one alone from now on.
Anyway, just fire it up it will be fine at that lift.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 07-24-2003, 11:57 PM
4 Jaw Chuck's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 46
Posts: 4,974
Wiki Edits: 0

Thanks: 2
Thanked 89 Times in 72 Posts
Check oil pressure?

How do you do that?

Actually any cam off the shelf will fit any engine with no interference problems whatsoever. Thats why you never need to check these things before installing them. If I am in doubt I just install the cam and worry about the consequence's later. You did deburr the cam before you installed it right? Bearing clearances?

No!? Ahhh, don't worry about it. Just another thing to slow ya down.

Your not mad at me are you Stinky? Please accept my deepest apology's...sniff...sniff.
__________________
Outlawed tunes from outlawed pipes
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 07-25-2003, 06:50 AM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
VALVE TO PISTON CLEARANCE

Stinky, it's always a good idea to mock up your engine and "clay up" a cylinder just for safety's sake. With the cam you have selected, you should be just fine. However, for your own peace of mind, mock up one cylinder head, put some clay on one piston and get ahold of one solid lifter to cycle your cam through it's lift cycle, then measure (if any) how much your clay was squashed. As noted before, you should be fine and dandy with your mild cam.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 07-25-2003, 07:16 AM
Frisco's Avatar
Glad To Be Here
 
Last photo:
Join Date: Nov 2002
Location: Canton, North Carolina
Age: 72
Posts: 2,244
Wiki Edits: 0

Thanks: 0
Thanked 8 Times in 8 Posts
Re: Valve to piston clearance

Quote:
Originally posted by Stinky
I have a 69' Pontiac 400 with A/T, A/C
The heads are stock.
I put a cam in with lift at valve: Intake .420"
Exhaust .442"
The stock valve lift is: Intake .410"
Exhaust .413"
My question is will this setup work with using stock heads??
( I havent the I.D. numbers on the heads)
I have a suggestion for you. Before making modifications, read the instructions, get a book or books on what you want to do. Talk or write to the manufacturers. Learn before you do. It will save you both time and money and you won't get so much 'Flac' from others.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 07-25-2003, 08:09 AM
gt2betubbed's Avatar
Kid With A Wrench...
 

Last journal entry: The Blower and test fit.
Last photo:
Join Date: May 2003
Location: Cali Baby!
Age: 35
Posts: 1,106
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
deburring?

Hey 4 Jaw, what do you do in order to deburr the cam?
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 07-25-2003, 08:11 AM
Stinky's Avatar
Suspended
 
Join Date: Jun 2003
Location: St. Louis, MO
Age: 36
Posts: 128
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
And it still continues. Tech board, tech help. Makes me wonder who the moderators are.
I did read the instructions and have books, like i said at first i just wanted to double, double check.
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 06:46 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.