C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

85 Corvette smoker

Thread Tools
 
Search this Thread
 
Old Feb 15, 2021 | 06:56 PM
  #1  
70vetteinpieces's Avatar
70vetteinpieces
Thread Starter
Melting Slicks
20 Year Member
Community Builder
Community Influencer
All Eyes On Me
 
Joined: Jan 2003
Posts: 2,545
Likes: 77
From: Toronto ohio
Default 85 Corvette smoker

Everytime I start up my 85 Corvette is bellows out a lot of smoke. I am assuming the valve seals have hardened over time and need replaced. Have a garage up north but 1,000 miles away. Called a few shops and they just blew me off and one replied they didn't have the tools to do it. Have a small 5 gallon air compressor and could rent a valve spring compressor. Think that would work? Also thought about performance heads but read doesn't help a stock engine very much.
I am near Brookfield if anyone recommends a garage close by
Reply
Old Feb 15, 2021 | 10:11 PM
  #2  
VikingTrad3r's Avatar
VikingTrad3r
Oil Producer
Supporting Gold
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2014
Posts: 9,375
Likes: 2,736
Default

5 gallon prob fine as long as it can recharge while being installed. tool is cheap.
Amazon Amazon

i used felpro intake seals on both and cork gaskets with hylomar properly applied for vc gaskets. easy job.
Reply
Old Feb 16, 2021 | 02:30 AM
  #3  
cv67's Avatar
cv67
Team Owner
15 Year Member
 
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Default

Lots of shops want nothing to do with working on these, same in my area.
If they said they dont have the tool they probably werent interested to begin with.
Reply
Old Feb 16, 2021 | 08:41 AM
  #4  
Phobos84's Avatar
Phobos84
Melting Slicks
Supporting Lifetime
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2002
Posts: 2,876
Likes: 764
From: Sligo PA
Default

It's sad because this isn't a difficult job at all. It's just time consuming. If you have the space and are willing to pick up a few extra tools then you can totally do this yourself. I think they even have a valve spring compressor at Harbour Freight. I know you can take the Harbour Freight compression tester and use it with a air chuck to hold the valves up. Also if you have a small compressor you don't need 100 psi to hold the valve up. 50 psi works great. This will help keep the compressor you have running less often during the job.
Reply
Old Feb 16, 2021 | 02:19 PM
  #5  
Natty C's Avatar
Natty C
Melting Slicks
Community Builder
Community Influencer
Community Favorite
Top Answer: 1
 
Joined: May 2019
Posts: 3,243
Likes: 1,404
From: Mid-Atlantic
2025 C4 of the Year Finalist - Unmodified
2023 C4 of the Year Finalist - Unmodified
2022 C4 of the Year Finalist - Unmodified
2021 C4 of the Year - Unmodified Finalist
Default

Originally Posted by cv67
Lots of shops want nothing to do with working on these, same in my area.
If they said they dont have the tool they probably werent interested to begin with.
That's something I noticed myself when I first bought mine.

Turned out to be a blessing, actually, because the one bigger job I did let a shop do was the rack and I still have to go back and adjust that thing right. Steering wheel is still off and the tie rods aren't adjusted evenly, so it has a different turn radius on each side. I'll have to make those adjustments myself when the weather breaks. The moral of that story is leaving a car with a mechanic who doesnlt really want to work on it is likely gonna leave you with a half-assed job.

When I went to pick it up the owner seemed like he was peeve just to have to work on the thing. Haven't been back there since.

Reply
Old Feb 16, 2021 | 09:11 PM
  #6  
70vetteinpieces's Avatar
70vetteinpieces
Thread Starter
Melting Slicks
20 Year Member
Community Builder
Community Influencer
All Eyes On Me
 
Joined: Jan 2003
Posts: 2,545
Likes: 77
From: Toronto ohio
Default

I have done a few overhead cam 4 cylinder engines and figure a v-8 wouldn't be too much different other than taking twice as long
Reply
Old Feb 16, 2021 | 10:05 PM
  #7  
Beater12's Avatar
Beater12
Racer
 
Joined: Mar 2016
Posts: 344
Likes: 65
From: Ontario, Canada
Default

I can't recall because it's been decades since I've seen it done but is it advisable to turn the motor over as you do each cylinder so you get the piston close to TDC? That way if you lose pressure for any reason the valve won't disappear into the cylinder?
Reply
Old Feb 17, 2021 | 05:21 AM
  #8  
Red86Z51's Avatar
Red86Z51
Safety Car
20 Year Member
Liked
Loved
Top Answer: 3
 
Joined: Mar 2003
Posts: 3,583
Likes: 504
From: Indianapolis IN
Finalist 2020 C4 of the Year - Unmodified
C4 of Year Finalist (stock) 2019
Default

Originally Posted by Beater12
I can't recall because it's been decades since I've seen it done but is it advisable to turn the motor over as you do each cylinder so you get the piston close to TDC? That way if you lose pressure for any reason the valve won't disappear into the cylinder?
There's no need rotate the engine if you use the compressed air method. The air in the cylinder holds the valves in place and keeps them from dropping. The only time you need to rotate the engine is when you're adjusting the valves upon completion of the seal install.

If you have the space, by all means do it yourself. It's an easy job and you'll save a lot of money.
Reply

Get notified of new replies

To 85 Corvette smoker

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo




All times are GMT -4. The time now is 02:22 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE