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

AFR Gasket Leaks

Thread Tools
 
Search this Thread
 
Old Nov 25, 2011 | 12:43 PM
  #1  
CAJUN C4's Avatar
CAJUN C4
Thread Starter
Safety Car
10 Year Member
 
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Default AFR Gasket Leaks

I did a search anf found my problem very common.My AFR's Centerbolt Valve Cover gasket is leaking. AFR recomends cutting the post 1/8" to 1/4" to allow more travel / pressure on the gasket because they don't cut the thread's base deep enough.?

Anyone have and fix this problem?

Thanx
Reply
Old Nov 25, 2011 | 01:04 PM
  #2  
tequilaboy's Avatar
tequilaboy
Melting Slicks
 
Joined: Aug 2003
Posts: 3,386
Likes: 390
From: Lakeville MI
Default

I put some washers under the bolts.
Reply
Old Nov 25, 2011 | 01:43 PM
  #3  
CAJUN C4's Avatar
CAJUN C4
Thread Starter
Safety Car
10 Year Member
 
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Default

Originally Posted by tequilaboy
I put some washers under the bolts.
It shouldn't have made a difference because the Posts need to be trimmed about an 1/8" inch. Washeres wouldn't do anything.AFR said they didn't machine the holes deep enough so shorten the stud posts and thia will allow more clamping load on the perimiter of the covers improving the seal.
Reply
Old Nov 25, 2011 | 03:02 PM
  #4  
THE 383 admiral's Avatar
THE 383 admiral
Melting Slicks
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Sep 2010
Posts: 2,422
Likes: 202
Default

And they are suppose to be one of the best... For that kinda of money they should fix.. or compensate
You for there poor QC
Reply
Old Nov 25, 2011 | 06:03 PM
  #5  
CAJUN C4's Avatar
CAJUN C4
Thread Starter
Safety Car
10 Year Member
 
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Default

I wonder if 1/4" would be too much ? Maybe compromise at 3/16"
Reply
Old Nov 26, 2011 | 01:55 PM
  #6  
STL94LT1's Avatar
STL94LT1
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Jan 2002
Posts: 12,261
Likes: 85
From: O'Fallon Missouri
Default

How hard would it be for AFR to make a simple tooling change to resolve this issue?
Reply
Old Nov 26, 2011 | 02:22 PM
  #7  
856SPEED's Avatar
856SPEED
Melting Slicks
10 Year Member
 
Joined: Apr 2007
Posts: 2,616
Likes: 111
Default



They are proud of their pieces no doubt.....for $2K for a set of heads, I don't expect to be drilling out things/adding washes/etc....pretty much expect plug and play......

I have the AFR/TPIS heads on mine......great set of heads no doubt, I went to the center bolt valve covers since TPIS center me center bolt vs. perimeter for my 85 forcing me to buy new valve covers (my engine builder offered to tap out the heads for perimeter since I had the stock valve covers which I declined) since I thought the center bolt were an upgrade anyway.....are they??? for oil leaks, always wondered that???

Not to change the subject but looking at TPIS's website it looks like they are offering a different set of aftermarket heads now....I did not see the AFR's out there anymore???? cost factor maybe?????
Reply
Old Nov 26, 2011 | 02:31 PM
  #8  
CAJUN C4's Avatar
CAJUN C4
Thread Starter
Safety Car
10 Year Member
 
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Default

Originally Posted by STL94LT1
How hard would it be for AFR to make a simple tooling change to resolve this issue?
Maybe the new ones are corrected. Mine are 5-6 years old. (NOS).Beautiful heads one would think Plug & Play for the price you pay.

Were going to fix mine tomorrow I'll post how we make out. Should be an easy fix as we won't have to remove the valve covers.
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 Nov 26, 2011 | 10:00 PM
  #9  
MarkBychowski's Avatar
MarkBychowski
Melting Slicks
25 Year Member
Conversation Starter
All Eyes On Me
Photogenic
 
Joined: Dec 1999
Posts: 2,816
Likes: 2
From: Austin, TX
Default

Mine are about 3 years old and had the same issue. Really easy fix though -- just cut about 3/16" off of the valve cover stud threads and it fit just fine.
Reply
Old Nov 27, 2011 | 01:37 PM
  #10  
CAJUN C4's Avatar
CAJUN C4
Thread Starter
Safety Car
10 Year Member
 
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Default

Wacked off 1/8" and it's fixed.

Thanx Guys for all your input.
Reply

Get notified of new replies

To AFR Gasket Leaks





All times are GMT -4. The time now is 03:40 PM.

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