when it didn't fit. I thought I remembered someone saying it damped vibrations that threw off airflow at high RPM's or something.
Is the LS3 padding/cover necessary?
Thread Starter
Le Mans Master
Joined: Jan 2007
Posts: 9,844
Likes: 33
From: S. FLA :: Professional Devil's Advocate
Is the LS3 padding/cover necessary?
I swapped LS3 heads and LS3 intake into my C5 corvette. Found out the LS3 intake is just to tall with the padding/cover on it. It fits just fine without it though.
I have maybe the thickness of a pencil in clearance with the padding/cover gone. It's so tight it wouldn't even fit with just the plastic cover and no padding.
What does that padding do? Is it just to quiet the engine down?
I have maybe the thickness of a pencil in clearance with the padding/cover gone. It's so tight it wouldn't even fit with just the plastic cover and no padding.
What does that padding do? Is it just to quiet the engine down?
Thread Starter
Le Mans Master
Joined: Jan 2007
Posts: 9,844
Likes: 33
From: S. FLA :: Professional Devil's Advocate
Melting Slicks
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
Please let me know if it does work as I have a friend who was considering this same mod but decided not to after being told it wouldn’t work.
Christopher
Thread Starter
Le Mans Master
Joined: Jan 2007
Posts: 9,844
Likes: 33
From: S. FLA :: Professional Devil's Advocate
I don’t mean to rain on your parade, but have you actually tried to fire it up yet? The reason I ask is that I was talking to somebody about this very same thing last week and was told that while they will physically bolt up to the engine the difference in the bore size is going to cause the valves to hit the side of the cylinders.
Please let me know if it does work as I have a friend who was considering this same mod but decided not to after being told it wouldn’t work.
Christopher
Please let me know if it does work as I have a friend who was considering this same mod but decided not to after being told it wouldn’t work.
Christopher
I have a "FrankenMotor", it's bolting up to a 408ci LQ9 (Iron truck block). You can't run the bigger bore LS3 on a smaller bore engine like the 349ci, that is correct. But it does fit and run on a bored out motor.
Fired it up today, need to add spacers to the valve covers but other then that it started up and ran fine.
Melting Slicks
Joined: Jul 2007
Posts: 3,097
Likes: 5
From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
I have a "FrankenMotor", it's bolting up to a 408ci LQ9 (Iron truck block). You can't run the bigger bore LS3 on a smaller bore engine like the 349ci, that is correct. But it does fit and run on a bored out motor.
Fired it up today, need to add spacers to the valve covers but other then that it started up and ran fine.
Fired it up today, need to add spacers to the valve covers but other then that it started up and ran fine.
Racer
Joined: Jun 2006
Posts: 410
Likes: 0
From: Berwick Louisiana
It knocks down the valve train noise and nothing else. I had to take mine off when I tapped the vacuum source for my mild to wild retrofit kit. It was such a pain to get it back in I left it off and noticed a significant increase in unwanted engine noise. My motor sounded way too much like a sewing machine so I put it back on.
Pro
Joined: Jun 2006
Posts: 589
Likes: 0
From: Cincinnati OH
I pulled my coil covers a couple weeks ago in preparation for headers and a coil relocation kit. The intake cover stood out once the coil covers were removed so I yanked the intake cover as well. It could just be me, but I can't say I've noticed a significant change in valvetrain noise as a result of pulling the intake cover. Maybe I'm going deaf. Huh?
Last edited by SSJCreeper; Aug 4, 2009 at 07:07 PM.
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