Need help explaining this bent valve
Thread Starter
Intermediate
Joined: Jun 2009
Posts: 38
Likes: 8
From: Illinois
Need help explaining this bent valve
I am not the most experienced engine guy in the world but I can't figure out how this could of happened.
LS7 Dry sump
C5R block
All pro heads
I had been fighting backfiring issues and poor performance for 4 years. I replaced the plugs, removed the remote coils and installed new ones, removed the Harrop intake and put a stock unit back on, re-tuned the engine multiple times, replaced the plug wires and removed the valve covers to inspect the springs. After 4 years of hell I pulled the engine and had it opened up. One of the valves was bent where you would expect it to be bent. But this valve was bent about an inch from the top.
Any ideas
LS7 Dry sump
C5R block
All pro heads
I had been fighting backfiring issues and poor performance for 4 years. I replaced the plugs, removed the remote coils and installed new ones, removed the Harrop intake and put a stock unit back on, re-tuned the engine multiple times, replaced the plug wires and removed the valve covers to inspect the springs. After 4 years of hell I pulled the engine and had it opened up. One of the valves was bent where you would expect it to be bent. But this valve was bent about an inch from the top.
Any ideas
Melting Slicks
Joined: Jul 2010
Posts: 3,006
Likes: 245
From: Surprise, Az
I don't expect any valve to be bent! That was quite a find. I wonder what the guides look like but it really doesn't matter at this point as the heads are probably off the the shop to get rebuilt with new guides.
Thread Starter
Intermediate
Joined: Jun 2009
Posts: 38
Likes: 8
From: Illinois
Yes the engine is back in the car after repairs and hopefully we will be done tomorrow night.
The guide had to be repaired.
The only thing I can think is improper installation of the guides.
The guide had to be repaired.
The only thing I can think is improper installation of the guides.
Thread Starter
Intermediate
Joined: Jun 2009
Posts: 38
Likes: 8
From: Illinois
I bought the car from the previous owner who had a relatively big name shop do the engine and switch to a dry sump LS-7. When I got the car it had a Harrup intake and the tune was very rich. So after the tune was adjusted to not be so obnoxious out the tail pipe I started to have troubles. Constant back firing and not much power for a 640 HP motor.
I don't remember the order that I did it but I replaced the plugs, the coils, plug wires, intake, the computer, and had it re-tuned several times. It would always run great after the tune, then it would go to hell shortly thereafter.
Almost done with the re-install after the valve repairs. I am hoping after 4 years I will finally get this car reliable.
I don't remember the order that I did it but I replaced the plugs, the coils, plug wires, intake, the computer, and had it re-tuned several times. It would always run great after the tune, then it would go to hell shortly thereafter.
Almost done with the re-install after the valve repairs. I am hoping after 4 years I will finally get this car reliable.
