LT4 - Top end noise
Le Mans Master
Joined: Mar 2001
Posts: 7,999
Likes: 14
From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
Cruise-In III Veteran
Cruise-In IV Veteran
St. Jude Donor '12
Yep, they are hard to come by. When I did my 92 it had the same washers in it.
Couldn't find any replacements, just used some copper ones coated them with RTV (just in case) hasn't leaked in a year of road racing.
Couldn't find any replacements, just used some copper ones coated them with RTV (just in case) hasn't leaked in a year of road racing.
Thread Starter
Melting Slicks
Joined: Apr 2002
Posts: 2,546
Likes: 0
From: Orlando FL
That was what I was leaning towards but wanted to get some others input on it. I do not want to reuse the old ones as the rubber is rotted out a bit. Just assume replace everything while I am there.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Although you haven't mentioned head bolts, as an "fyi" the stock head bolts should not be reused. They are torque to yield.
Thread Starter
Melting Slicks
Joined: Apr 2002
Posts: 2,546
Likes: 0
From: Orlando FL
I guess I will be making a trip over to the Chevy dealer to see if they have the washers. As for the bolts - yes, I have purchased some factory replacements.
Thanks all! I will update once it is all back together.
Thanks all! I will update once it is all back together.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
No explanation was given in the FSM for the change in torquing procedure but my thinking is GM now feels the new procedure results in more equal clamping force, eliminating differences in torque wrench readings.
Now, of course, he can replace them if he wants; it's optional.
Jake
West Point ROCKS! Nation's TOP COLLEGE per Forbes Magazine!! Graduation Day Parade 20 May 2010!!!
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Well my recent LT4 purchase looks like it will be costing me even more money. It is a good thing I hardly paid anything for it. Today I diagnosed part of the top end ticking noise I was hearnig at idle.
I removed both valve covers and inspected the lifters. The rocker on the right side of cylinder #7 was very loose. I tried to tighten it but the nut will not go any further. A close inspection showed me that something has got to be wrong in there. I removed the rocker and noticed some wear marks on the roller tip end where it meets springs. I removed the pushrod and it appears to be straight as an arrow. It also appears to be extended the same length as the others eliminating the possibility of a collapsed lifter. I inspected the spring and could not tell if it is broken. It does however look more compressed even though there is no pressure on the top. Can anyone give me any insight to this? At this time I am assuming the worst - a bent valve.
I removed both valve covers and inspected the lifters. The rocker on the right side of cylinder #7 was very loose. I tried to tighten it but the nut will not go any further. A close inspection showed me that something has got to be wrong in there. I removed the rocker and noticed some wear marks on the roller tip end where it meets springs. I removed the pushrod and it appears to be straight as an arrow. It also appears to be extended the same length as the others eliminating the possibility of a collapsed lifter. I inspected the spring and could not tell if it is broken. It does however look more compressed even though there is no pressure on the top. Can anyone give me any insight to this? At this time I am assuming the worst - a bent valve.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Melting Slicks
Joined: Mar 2004
Posts: 2,141
Likes: 2
From: Pittsburgh Pa
Thread Starter
Melting Slicks
Joined: Apr 2002
Posts: 2,546
Likes: 0
From: Orlando FL
Nice post - I will certainly check to see if my car was serviced on the recall - but regardless - that is/was not my issue. Valve seat fell probably due to overheating. Heads have been done and I should be set. It will be a few days before I get a chance to finish the assembly. Maybe by mid next week. Thanks guys!
