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

Valve Cover Question

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Old May 27, 2013 | 02:01 AM
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Default Valve Cover Question

As you can see in the inserted image I have custom powder coated stock valve covers that I have gutted to fit over my 1.6 aluminum roller rockers. I have also powder coated my superram to match as well. I have run the motor for less than 1000 miles before installing the superram without any trouble.
Am I going to have any problems running them or do I need to switch to tall valve covers? Will the short valve covers cause issues with lubrication? Is there any danger of damage under high speed or power? Any advice?
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Old May 27, 2013 | 02:12 AM
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I had the same setup under the valve covers on an 88 IROC. No problems.
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Old May 27, 2013 | 03:28 AM
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Very nice looking setup.

I ran ProMagnum 1.6:1s under re-painted OEM valve covers in my '88 with never a problem in 10 years of 1/4 mile fun, not even with 6,000rpm shift points.

I had narrowed the bolt posts and cut off the drip tabs for clearance.
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Old May 27, 2013 | 10:10 AM
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I used the stock covers from my 85 when I built my ZZ4 with the LP74211 cam. This cam has over a .530 lift with 1.6 roller rockers. I did sand off the upper corner on the RR at a 45 to take off about 1/8" to clear the covers. I also added the the tallest VC gaskets that I could find. The exhaust RR was just kissing the cover with a standard gasket and before I sanded off the corners of the RR. Not a problem after that. I was also running the SuperRam like you.
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Old May 27, 2013 | 01:09 PM
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Very nice setup. Looks just like mine without the blue
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Old May 27, 2013 | 03:21 PM
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No problems with my stock and aftermarket short covers.


I see no PVC valve. How are you pulling out the crankcase gases ?
Is the fresh air port on TB and the manifold vacuum port plugged ?
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Old May 27, 2013 | 11:36 PM
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I have pluged the Manifold and TB ports. Do I need to re install them or will the breather filters work?
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Old May 27, 2013 | 11:46 PM
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Originally Posted by 89L98TPI
Very nice setup. Looks just like mine without the blue
I had the valve covers powder coated first.I am glad to hear I do not have to get rid of them. Then when I got the Superram I had to have it done as well. Eventually the plan is to have the car painted White with a candy blue grand spot stripe to match the motor.
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Old May 28, 2013 | 08:03 AM
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Originally Posted by bdaum2112
I have pluged the Manifold and TB ports. Do I need to re install them or will the breather filters work?
The breathers will work, but PCV is better in my mind.

Here's your yellow cousin


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