C3 General General C3 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

Oil on intake manifold

Thread Tools
 
Search this Thread
 
Old Aug 25, 2021 | 06:32 PM
  #21  
mh_merc's Avatar
mh_merc
Advanced
All Eyes On Me
Liked
Loved
 
Joined: Jul 2021
Posts: 68
Likes: 29
From: San Clemente, CA
Default

Originally Posted by 7T1vette
Probably is wicking up that bolt....
It shouldn't any more; I sealed it up yesterday.
Reply
Old Aug 25, 2021 | 10:27 PM
  #22  
1973bluevettee's Avatar
1973bluevettee
Thread Starter
Instructor
 
Joined: Apr 2021
Posts: 133
Likes: 5
Default

Originally Posted by mh_merc
It shouldn't any more; I sealed it up yesterday.
- I think he was taking about the picture that I sent
Reply
Old Aug 30, 2021 | 08:58 AM
  #23  
1973bluevettee's Avatar
1973bluevettee
Thread Starter
Instructor
 
Joined: Apr 2021
Posts: 133
Likes: 5
Default

So I put sealer on the bolt threads and it stopped the puddles on my intake but there’s still little bits of oil where the intake bolts to the block just no more puddles on the intake so I don’t get why there’s still a little oil when I sealed all the bolts
Reply
Old Aug 30, 2021 | 10:09 AM
  #24  
Eliredandblack's Avatar
Eliredandblack
Melting Slicks
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Feb 2018
Posts: 2,315
Likes: 717
From: Marietta GA
Default

Originally Posted by 1973bluevettee
So I put sealer on the bolt threads and it stopped the puddles on my intake but there’s still little bits of oil where the intake bolts to the block just no more puddles on the intake so I don’t get why there’s still a little oil when I sealed all the bolts
I am by no means an engine builder, but was told by a Corvette Service Shop to use this product for the oil weeping at the intake bolts.

Good up to 400 degrees

Reply
Old Aug 30, 2021 | 10:15 AM
  #25  
sw69vette's Avatar
sw69vette
Racer
Supporting Gold
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 264
Likes: 200
From: Sicklerville NJ
2022 C3 of the Year Finalist - Unmodified
Default

Putting sealant ,on the bolts , only sealed the bolts but didn`t seal the intake gasket . It sounds like oil is leaking from the china wall area . If so you will need to R&R intake gasket . A picture will help . I don`t want to give you wrong repair advice
Reply
Old Aug 30, 2021 | 10:37 AM
  #26  
1973bluevettee's Avatar
1973bluevettee
Thread Starter
Instructor
 
Joined: Apr 2021
Posts: 133
Likes: 5
Default

Originally Posted by Eliredandblack
I am by no means an engine builder, but was told by a Corvette Service Shop to use this product for the oil weeping at the intake bolts.

Good up to 400 degrees

-I used permatex ultra black good up to 500 degrees Fahrenheit
Reply
Old Aug 30, 2021 | 03:46 PM
  #27  
HeadsU.P.'s Avatar
HeadsU.P.
Le Mans Master
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Aug 2017
Posts: 8,336
Likes: 2,809
From: Cool Northern Michigan
Default

Oil leaking from either China wall tends to run downward onto bellhousing or the timing cover pad.

There is absolutely no pressure from the crankcase in reference to the Intake bolts leaking. However, those bolt will and do "wick" oil mist from the lifter valley.

1973bluevette,
No offense, but you have the crappiest Intake Manifold bolts one could buy, sorry. They appear to be twenty-five cent hardware from Ace with a ten cent washer.
Those type of washers do not seal well and are prone to gouging the soft aluminum Intakes. Those six sided bolts make things a lot harder to get a wrench / socket on too. You deserve better. Nice looking engine.

You will be a lot farther ahead with your issue if you buy the proper Intake bolts.
Looking at Summit Racing, in the search box enter SBC Intake bolts.
They have a package set, correct diameter, correct length, correct thread pitch and the correct number of bolts. Plus they have the built-in washer and are 12 sided.
All you have to do is decide on shiny Stainless or oxide black. If you buy ARPs, you will have top-of-the-line.

Then starting with the number one bolt position on the Intake, remove, dab of Permatex Black, replace with new, torque.
Then move on to number two bolt and so on.

Reply
Old Aug 30, 2021 | 04:22 PM
  #28  
1973bluevettee's Avatar
1973bluevettee
Thread Starter
Instructor
 
Joined: Apr 2021
Posts: 133
Likes: 5
Default

Originally Posted by HeadsU.P.
Oil leaking from either China wall tends to run downward onto bellhousing or the timing cover pad.

There is absolutely no pressure from the crankcase in reference to the Intake bolts leaking. However, those bolt will and do "wick" oil mist from the lifter valley.

1973bluevette,
No offense, but you have the crappiest Intake Manifold bolts one could buy, sorry. They appear to be twenty-five cent hardware from Ace with a ten cent washer.
Those type of washers do not seal well and are prone to gouging the soft aluminum Intakes. Those six sided bolts make things a lot harder to get a wrench / socket on too. You deserve better. Nice looking engine.

You will be a lot farther ahead with your issue if you buy the proper Intake bolts.
Looking at Summit Racing, in the search box enter SBC Intake bolts.
They have a package set, correct diameter, correct length, correct thread pitch and the correct number of bolts. Plus they have the built-in washer and are 12 sided.
All you have to do is decide on shiny Stainless or oxide black. If you buy ARPs, you will have top-of-the-line.

Then starting with the number one bolt position on the Intake, remove, dab of Permatex Black, replace with new, torque.
Then move on to number two bolt and so on.


- yeah they were on the intake when I bought the car not a bad idea I’ll get some off summit and do that thanks😁
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-1

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-2

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-3

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-4

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-5

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
story-6

2027 Corvette vs The World: Every C8 vs Its Closest Competitor

 Joe Kucinski
story-7

10 Most Common Corvette Problems of the Last 20 Years!

 Joe Kucinski
story-8

5 MOST and 5 LEAST Popular Corvette Model Years in History!

 Joe Kucinski
story-9

2027 Corvette Buyer's Guide: Everything You Need to Know!

 Joe Kucinski
Old Aug 30, 2021 | 05:14 PM
  #29  
1973bluevettee's Avatar
1973bluevettee
Thread Starter
Instructor
 
Joined: Apr 2021
Posts: 133
Likes: 5
Default

Here’s the picture after the car has been running you can see the puddles are gone because I put sealer on all the bolts but you can still see oil at the block and where the intake meet

Reply
Old Aug 30, 2021 | 06:47 PM
  #30  
HeadsU.P.'s Avatar
HeadsU.P.
Le Mans Master
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Aug 2017
Posts: 8,336
Likes: 2,809
From: Cool Northern Michigan
Default

H-m-m-m-m-. A little left-over residue from bolts?

But this topic still goes back to:
PCV Valve functioning with great evacuation?
Baffle under the PVC?
PVC grommet?

Now I see wing style V. cover fasteners. You can go ahead and crank those down a little more by hand.
Those poor Intake bolts have rounded corners from abuse.

If everything runs all right, no vacuum loss, then I doubt the Intake gaskets are leaking oil.

Last edited by HeadsU.P.; Aug 30, 2021 at 06:49 PM.
Reply
Old Aug 30, 2021 | 10:47 PM
  #31  
1973bluevettee's Avatar
1973bluevettee
Thread Starter
Instructor
 
Joined: Apr 2021
Posts: 133
Likes: 5
Default

Originally Posted by HeadsU.P.
H-m-m-m-m-. A little left-over residue from bolts?

But this topic still goes back to:
PCV Valve functioning with great evacuation?
Baffle under the PVC?
PVC grommet?

Now I see wing style V. cover fasteners. You can go ahead and crank those down a little more by hand.
Those poor Intake bolts have rounded corners from abuse.

If everything runs all right, no vacuum loss, then I doubt the Intake gaskets are leaking oil.
-yes I have everything correct new pcv valve with grommet and baffle in my breather cap no oil coming from around any of those and new valve cover gaskets and there tightened down constantly I always check them
Reply
Old Aug 31, 2021 | 07:01 AM
  #32  
sw69vette's Avatar
sw69vette
Racer
Supporting Gold
Loved
Community Favorite
 
Joined: Apr 2020
Posts: 264
Likes: 200
From: Sicklerville NJ
2022 C3 of the Year Finalist - Unmodified
Default

It could still be from intake gasket . If oil has been leaking for a long time , gasket is oil soaked and porous , and no amount of tightening will stop leak . I have seen this happen before from being a auto tech , for 45 years , before retiring .
Reply
Old Aug 31, 2021 | 07:56 AM
  #33  
derekderek's Avatar
derekderek
Race Director
 
Joined: Jul 2015
Posts: 13,082
Likes: 3,399
From: SW Florida.
Default

could just be left over oil stuck in the corner. try a little carb or brake cleaner. if you do replace the intake, i like to RTV the gasket to the block. using china wall gaskets as side gasket positioners. set intake on to clamp gasket down. no sealer on top of gasket. then remove intake and check that gasket is where you want it. it is now gonna stay there. remove china wall gaskets. replace with bead of RTV. little RTV on water openings. install intake. a lot of intake gasket issues are cuz the gasket shifted during install.
Reply




All times are GMT -4. The time now is 11:48 AM.

story-0
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-1
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-2
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-3
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-4
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-5
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-6
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-7
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-8
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-9
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE