C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Engines
Not Logged In! Login or Register!  Users Online: 16 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Volunteer Vette Products
VetteBookStore.com
Mid America Motorworks
CorvetteClothing.com
Bair's Corvettes

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
XCITE U 2
Gregg
Featured Links

Buy Now
Corvette by the Numbers
Corvette by the Numbers


Corvette Fifty Years (Hardcover)
Corvette Fifty Years (Hardcover)


Kindle
Kindle


Motor Trend - $5 for 12 issues.
Motor Trend
Only $5 for 12 issues.



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1] 2  
6/3/12 11:03am - Original Message: 'valve seals'
myhigh76
Former Member
- Send Private Message


Traverse City, MI - USA

Vette(s):
1976 coupe 35K miles

Joined: 12/15/2011
Posts: 6
My '76 needs new valve seals, you know, embarrassing smoke when starting . My question is :  What should I expect to pay for this type of repair??  I live in upper Michigan and need some member input so  I don't get taken to the cleaners.  


____________________________________
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
6/3/12 9:42pm - Reply: 'Re: valve seals'
yostusota
Former Member
- Send Private Message


York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
Well...this all depends on what you do..if you replace just the valve seals with the heads still on the car it doesn't cost much at all..couple hours labor and seals are cheap...kinda band aid fix but will work for a good while if the guides are ok...if you want or the guides need done then your looking at head removal...then there's 2 ways to have it done...knurle the guides oversize or replace with bronze..also..might want to put the bigger valves in it too...this really comes down to how much you're willing to spend at the machine shop...for this price call around and find out what machine shops charge...don't rule out the little guy who builds race engines too...can find some great machinists that way...one word of cation though..if your engine has a bunch of miles on it you may want to just do the seals and be done with it...having the heads done can blow out the rings...meaning more smoke all the time...it really comes down to the condition of the motor as it sits now..or how much money you got!! I know this doesn't hit on how much..but knowing options of repair can give you the info you need to get solid quotes in your area.

____________________________________

My first parade at Carlisle 2010
 Reply Reply  Quote Reply w/Quote
6/4/12 12:22am - Reply: 'Re: valve seals'
daveo76
Standard Member
- Send Private Message


Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
I'll second what Rich says about an all new top end possibly causing more problems than it solves.  When my wife and I were dating she had a little Acura Integra that broke a timing belt.  Since it was an interference engine all the intake valves got bent and we had to have the head completely rebuilt with a valve job.  The like new top end caused blow-by past the rings and we started burning oil like crazy - had to add a quart every time we filled up.  Ended up trading that car in pretty quick after that.  I think new seals would be the way to go unless you're looking at least new rings but probably a full rebuild.  

____________________________________

 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
 Reply Reply  Quote Reply w/Quote
6/4/12 1:18pm - Reply: 'Re: valve seals'
tinbender
Former Member
- Send Private Message


edgwood, MD - USA

Vette(s):
1975 convertible,with the hard top and power streering.it a 350 L48 with auto trans. the color is light blue.

Joined: 11/1/2007
Posts: 736
I just had mine done,and it made a world of difference....no more smoke.The shop that did mine said what Rich about about just rebuilding the top half.Here in Maryland it cost me $200.00 for the seals to be done.
                                Rick


____________________________________

(click to see a larger image)
 Reply Reply  Quote Reply w/Quote
6/4/12 2:35pm - Reply: 'Re: valve seals'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
I'm trying to wrap my widdle pea-brain around something here...
How can knurling, or replacing the valve guides cause more cylinder pressure? Knurling, or replacing the guides should have no effect on the compression....or am I missing sumptin here?
True, doing a complete valve job on a worn head can cause problems for the ring sealing on a worn/"experienced" engine, but I'm not getting the deal with just replacing/knurling the guides.
Not tryin to be a jerk or anything...just trying to figure it out. I ain't done any major engine work in years so....Embarrassed


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
6/4/12 3:19pm - Reply: 'Re: valve seals'
yostusota
Former Member
- Send Private Message


York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
I'm with ya bud..what I was getting at if you deck the heads and put new valves in with new or machined seats..I'm not really a fan of knurling the guides either but thats just me..if the seals were just replaced and thats it there would be no change in compression of course...other thing too if the guides are knurled or replaced the valve seats would have to be fitted or machined to the valves to properly align the valves with the seats which would incur more cylinder pressure.

|UPDATED|6/4/2012 12:19:52 PM (AZT)|/UPDATED|


____________________________________

My first parade at Carlisle 2010
 Reply Reply  Quote Reply w/Quote
6/4/12 5:20pm - Reply: 'Re: valve seals'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Handshake

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
6/9/12 11:12pm - Reply: 'Re: valve seals'
johnnyjaws
Former Member
- Send Private Message


newburgh, NY - USA

Vette(s):
1976 stingray l 48

Joined: 6/8/2012
Posts: 3
i just did mine on my 76 and it took a lot longer than a couple hours  about 9 hrs  doing it myself parts cost me 20.00  car only has 49000 miles but it sat for 16 yrs  and the seals tryed up hard and brittle its a lot of work
 Reply Reply  Quote Reply w/Quote
6/9/12 11:17pm - Reply: 'Re: valve seals'
johnnyjaws
Former Member
- Send Private Message


newburgh, NY - USA

Vette(s):
1976 stingray l 48

Joined: 6/8/2012
Posts: 3

oops



|UPDATED|6/9/2012 8:17:13 PM (AZT)|/UPDATED|
 Reply Reply  Quote Reply w/Quote
6/9/12 11:27pm - Reply: 'Re: valve seals'
tb2k82ce Lifetime Member
Lifetime Member
- Send Private Message


Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2007
If you do it yourself it is a lot of work.  But most shops will figure it at about 3 or 4 hours plus parts.  The parts are cheap.  Someone may have the book on the time and can give it to us.  If not let me know and I will go down to my mechanic on Monday and ask him.  I will be having him do that job for me anyway.  Finding out what the book says on the time I believe is a better measure.  My guy goes the book for time and then discounts the labor hours for me.  

____________________________________
 
 Reply Reply  Quote Reply w/Quote
6/12/12 7:44am - Reply: 'Re: valve seals'
tonytheroofer
Former Member
- Send Private Message


Rochester, NY - USA

Vette(s):
1980 L- 82 fully restored and upgraded.

Joined: 6/12/2012
Posts: 95
I replaced just the seals on my C-4 , it was easy . And it totally solved the issue of start up smoke. The biggest challenge is getting the inexpensive tools ,  most parts people are kids so hit a napa or a well established store in your area, get a spring compressor and the hose you screw into the spark plug threads to pressurize the cylinder . Basic hand tools for valve cover removal new gaskets and new plugs because you pull old ones anyway ! Will take about 3 hours a side on average. 

____________________________________
1980 , ZZ430 , 3.92 rear , 700R4 2400 stall NEW EZ EFI 
 Reply Reply  Quote Reply w/Quote
6/18/12 12:13pm - Reply: 'Re: valve seals'
myhigh76
Former Member
- Send Private Message


Traverse City, MI - USA

Vette(s):
1976 coupe 35K miles

Joined: 12/15/2011
Posts: 6
THANK YOU !!! to all the folks who replied to my valve seal question . This forum is a great resource for rookies like me. Thanks again!!


____________________________________
 Reply Reply  Quote Reply w/Quote
6/18/12 12:30pm - Reply: 'Re: valve seals'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Book shows 6 hours for both sides....prolly pretty close, depending on if it has A/C, cruise control, etc.

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
6/18/12 8:24pm - Reply: 'Re: valve seals'
johnnyjaws
Former Member
- Send Private Message


newburgh, NY - USA

Vette(s):
1976 stingray l 48

Joined: 6/8/2012
Posts: 3
book time dont mean youll have it done though them plugs are hard to get too. while your in there clean up the valve covers with some paint
 Reply Reply  Quote Reply w/Quote
6/25/12 2:02pm - Reply: 'Re: valve seals'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 382
If you happen to drop a valve, you can retrieve it w/ a magnet that fits in the valve guide.  Best to run piston to TDC before removing springs tho.

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
8/10/12 11:03am - Reply: 'Re: valve seals'
ROCKRDR
Former Member
- Send Private Message


Lakeside, AZ - USA

Vette(s):
1975 C3 Stingray

Joined: 7/23/2012
Posts: 126
I dont know how much you like to work on engines, but the easy trick to change out
the seals is make sure the piston is down, pull the plug stuff the cylinder with nylon rope 
than have the cylinder come up to hold the valve and from the top of the motor you can
compress the valve spring and remove the spring and keepers (make sure there is NO way
for the stuff to fall in the engine)...remove the seal put the new seal on..than reverse the steps


just a thought..


____________________________________
1975 Corvette Coupe 
My first Vette.....trying to fix stuff

My Project:
https://docs.google.com/folder/d/0B6uOAIjGf3cWejQ5TjNkcVRybGs/edit
 Reply Reply  Quote Reply w/Quote
8/10/12 9:48pm - Reply: 'Re: valve seals'
kendo2
Former Member
- Send Private Message


Ormond Beach, FL - USA

Vette(s):
77 coupe, yellow, auto, L series, A/C, T top, Grey leather interior. It is about 75% & matching #'s. The miles are 117K & intend on restoring bit by bit to enjoy Cruises & rallies in Florida , & maybe some shows ?

Joined: 7/28/2012
Posts: 19
I know this sounds like going against tradition and it makes me a little uneasy. But, we used to put small block Ford valve seals to replace the little "O" ring Chevy seals that BRITTLE & BREAK up because of the high temps all the time. They fit over the top of the valve guide nicely, cost very little, & last a lot longer. You just need to make sure you fit them over the valve stem & they have a good amount of interference when you slide them down. I think we used to buy the 302ci. valve seals (bonnets) for this job. Hey, I know it is against all the unwritten rules. But you will never have to do this job again, I garranty !!!!
 Reply Reply  Quote Reply w/Quote
8/10/12 10:16pm - Reply: 'Re: valve seals'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 382
Do those "umbrella" type seals allow sufficient oil down the valve guides?

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
8/11/12 10:37am - Reply: 'Re: valve seals'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
The umbrella seals are fine, imo. That's all I've ever used. The idea is to keep excessive oil from running down the valve stem into the chamber thru the guides, not to keep any oil at all from getting to the guides. If you think aboot it, the little o-ring type seals are pretty much useless for anything other than lessening the amount of oil running down the stem after the engine is off. With the umbrella type seals, you will still get lubrication oil down into the guides. Thumbs Up

Most engines now have positive seals on the valves, that seal both to the stem, and the guide...


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
8/12/12 7:56pm - Reply: 'Re: valve seals'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 382
While the only umbrella seals I've seen were on a friend's 66 427, they were a tight fit to the valve stem.  Not sure how any oil could get past them and down in the guides.

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1] 2  
 Forums -> C3 Engines
(Moderator: Adam Wartell, Norsky, Adams' Apple)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30