C4 General Discussion General C4 Corvette Discussion not covered in Tech

EM longtubes problem !!

Thread Tools
 
Search this Thread
 
Old Dec 12, 2011 | 02:45 AM
  #1  
Mohammed_z's Avatar
Mohammed_z
Thread Starter
Drifting
15 Year Member
Liked
 
Joined: Jan 2010
Posts: 1,624
Likes: 48
From: Saudi Arabia
Default EM longtubes problem !!

After fixing the broken bolt inside the cylinder head , I installed the EM longtubes. There was a leak in the driver side.

Changed the gasket to something better and thicker. The leak is still there !!

I doubt there is a problem with the headers surface. I need to remove it and check if it's 100% flat.




this is not my lucky month. if there was a problem with the headers I can't send it back to the U.S. it will cost me the same price of the headers for the shipping.

Do I need to take it to the turnery ??
Reply
Old Dec 12, 2011 | 07:19 AM
  #2  
aminnich's Avatar
aminnich
Le Mans Master
 
Joined: Jan 2006
Posts: 6,564
Likes: 6
From: Woodstock Georgia
Default

Are you using Percy gaskets?
Reply
Old Dec 12, 2011 | 08:30 AM
  #3  
c4speed's Avatar
c4speed
Pro
 
Joined: Jul 2011
Posts: 544
Likes: 0
From: Atco Raceway in between Pa & Nj 13.073 @ 106 MPH
Default

Should of used OBX the shipping to China would of been cheaper.
Reply
Old Dec 12, 2011 | 08:52 AM
  #4  
Mohammed_z's Avatar
Mohammed_z
Thread Starter
Drifting
15 Year Member
Liked
 
Joined: Jan 2010
Posts: 1,624
Likes: 48
From: Saudi Arabia
Default

Originally Posted by aminnich
Are you using Percy gaskets?
I used felpro



Originally Posted by c4speed
Should of used OBX the shipping to China would of been cheaper.

Really !!! that was helpful
Reply
Old Dec 12, 2011 | 10:32 AM
  #5  
motor city dave's Avatar
motor city dave
Le Mans Master
 
Joined: Aug 2011
Posts: 5,599
Likes: 10
St. Jude Donor '16
Default

Originally Posted by c4speed
Should of used OBX the shipping to China would of been cheaper.
Reply
Old Dec 12, 2011 | 10:39 AM
  #6  
kmillar's Avatar
kmillar
Racer
15 Year Member
All Eyes On Me
 
Joined: Aug 2006
Posts: 277
Likes: 8
From: Calgary Alberta
Default

Not sure if I missed it, where exactly was/is the leak? Is it on the flange between the header and the head? If so:
- what cylinder#?
- I take it you cleaned the old head surface very well?
- there weren't any gouges on the mounting surface?
-did you slowly tighten the header flange, moving each way, from the inside to outside?
I have EM longtubes also, I just used the gaskets that were supplied with the kit. I'm sure it's something easy don't panic.
Reply
Old Dec 12, 2011 | 10:52 AM
  #7  
96GS#007's Avatar
96GS#007
Race Director
 
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Default

Use the Percy's dead-soft aluminum gaskets. Much better than the traditional gaskets and their re-usable.

You also need to make sure there are absolutely no clearance issues, otherwise the headers won't be 100% flat against the cylinder head when you install them. On mine, the headers were very, very close to the engine mount bracket on the driver's side. I used a die grinder to remove ~0.25" for peace of mind and ease of fitting.
Reply
Old Dec 12, 2011 | 01:53 PM
  #8  
Mohammed_z's Avatar
Mohammed_z
Thread Starter
Drifting
15 Year Member
Liked
 
Joined: Jan 2010
Posts: 1,624
Likes: 48
From: Saudi Arabia
Default

it was the mount bolt as the shop stated. They fixed the problem and i'll make few test drives to make sure there is no leak
Reply

Get notified of new replies

To EM longtubes problem !!

Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

 Michael S. Palmer
story-1

5 Best & 5 Worst Corvette Daily Drivers

 Joe Kucinski
story-2

The Headlights of Every Corvette Generation Explained

 Joe Kucinski
story-3

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

 Joe Kucinski
story-4

Every 2027 Corvette Engine Explained

 Joe Kucinski
story-5

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

 Verdad Gallardo
story-6

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-7

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-8

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-9

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei




All times are GMT -4. The time now is 03:29 AM.

story-0
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-1
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-2
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-3
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-5
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-6
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-7
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-8
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-9
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