Stupid Chevy question - 460 Ford Forum
Chilly's Garage A place for non-460 banter.

User Tag List

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 5 (permalink) Old 02-03-2007, 12:13 PM Thread Starter
Senior Member
 
Join Date: Jan 2006
Location: Patricia, Alberta, Canada
Posts: 476
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Stupid Chevy question

I'm changing valve seals on a young guys 1994 Chevy truck with a 350. Ordinarily, I wouldn't have anything to do with a Chev, but his dad was a good friend of mine, and he died a year ago, so I offered to help. My question is...can I use the same seals on the exhaust as the intakes? The parts guy told me the book just showed the little o-ring below the locks on the exhaust, and nothing else, and I'd already pulled one and it had an umbrella seal on it, so I grabbed 2 sets of intake seals. The only real difference I can see is the intake seal has a metal band around it, and the exhaust doesn't.
I know this sounds like a retarded question, but I've never worked on a Chev before. And hopefully never again. You can't put a wire in the spark plug hole to feel for the piston because the plug lays so flat, you have to grind the AC compressor bracket bolts half off to get them by the clutch because the valve cover can't get by the compressor, there's no fender relay for the remote starter switch... :roll:

668. The neighbour of the beast.
John I. is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 02-03-2007, 01:20 PM
Senior Member
 
Join Date: Jan 2006
Location: Southern Ohio
Posts: 1,650
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
 
The valve stem seals on my 94 Suburban differed between exhaust/intake, and I assume a good reason exists.
jpierce55 is offline  
post #3 of 5 (permalink) Old 02-03-2007, 02:59 PM
 
Join Date: Dec 2006
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
The seal with the metal band around it, is a positive type seal, not an umbrella. They push down over the O.D. of the valve guide. The exhausts still use an umbrella type (usually made of white teflon, or orange silicone due to high temps), as the oil atmosphere better lubricates the hot running exhaust valve stems.
chillz1 is offline  
 
post #4 of 5 (permalink) Old 02-03-2007, 04:26 PM Thread Starter
Senior Member
 
Join Date: Jan 2006
Location: Patricia, Alberta, Canada
Posts: 476
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
The thing that has me confused is the exhaust seals are fitted onto the guide too - just like the positive type seals. Thanks for the replies guys. I'll go back in and work the parts guy over again.

668. The neighbour of the beast.
John I. is offline  
post #5 of 5 (permalink) Old 02-05-2007, 11:53 PM
 
Join Date: Dec 2006
Posts: 38
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Quote:
Originally Posted by John I.
The thing that has me confused is the exhaust seals are fitted onto the guide too - just like the positive type seals. Thanks for the replies guys. I'll go back in and work the parts guy over again.
If both sets of seals are the positive type, there is definitely a difference between intake and exhaust. Primarily in seal material. Personally I would never use a positive seal on SBC exhaust valves. They run too hot and tend to wear out even with the oil saturated atmosphere of umbrellas. The positives are great to use on the intakes, but on the exhaust, use a teflon umbrella, and your OEM o-ring seal as well. Don't forget to use the little plastic installation sleve when sliding the seals over the valve stems, as the lock grooves can damage the sealing surface. Good luck!
chillz1 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the 460 Ford Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



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

 
For the best viewing experience please update your browser to Google Chrome