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

Warped Superram Lid

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Old Oct 3, 2024 | 01:43 PM
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Default Warped Superram Lid

In the process of dry fitting my Superram intake, and while it's relatively straightforward, the lid seems to be the old cast type that was notorious for leaking without a tube's worth of RTV sealing it. Placing it on the plenum and a flat surface to check, it definitely "bounces". Pushing one end flush raises the other end about 1/16 to 1/8 an inch. From what I read you used to be able to exchange these with Accel for a billet lid, but I don't think that's an option anymore...

The only options I can think of are to either deck the whole lid surface flat, or drill and tap an extra set of holes and double the screw count, doing what the prototype Superram did with its lid. Do either of these seem like viable solutions?
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Old Oct 3, 2024 | 02:46 PM
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Mine rocks a bit-though an 1/8 inch does sound like a lot. I just tightened the bolts as if it was a head-back and forth a little at a time and it pulls it down flat and even.
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Old Oct 3, 2024 | 02:49 PM
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I never had an issue with mine. It never leaked, and it was cast.


That said, you should be able to have a machine shop make you a billet or sheet lid
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Old Oct 3, 2024 | 03:29 PM
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I ran a SuperRam for years. I rtv'd the lid down and didn't touch it during many teardowns. I accessed the bolts from below. As mentioned, the lid should tighten down when the bolts are tightened.
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Old Oct 4, 2024 | 10:04 AM
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I put grease on my Gasket so that it wouldn't tear when I remove the Lid. It has the Bolts spaced close enough together that it could be warped pretty badly and still be tightened down and seal. OK so let's say that it is going to leak. Obviously, its going to be a minor leak at best. The Throttle Blades when closed have a bypass hole which is basically just an engineered leak to let the engine idle. The ECM should be able to compensate for a minor leak. When using a bigger Camshaft to get the engine to idle one might need to adjust the Throttle Blades to be open a bit anyway. When the engine is idling pull the Brake Booster Hose off which creates a huge leak. The ECM will stumble till it figures out what happened and then it will compensate but it should keep running. The last Autocross I did I made one lap and just looked things over and realized my Brake Booster was not hooked up. (Engine ran fine brakes not) OK let's say it a Boosted engine. Now you have Air leaking out when under Boost rather than in. Since the Air leaking is before the Injectors then it shouldn't cause an under-hood explosion. It does make one wonder how much Boost it can take before bulging it's a pretty large flat surface.
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Old Oct 4, 2024 | 06:28 PM
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Originally Posted by TPIGroove
In the process of dry fitting my Superram intake, and while it's relatively straightforward, the lid seems to be the old cast type that was notorious for leaking without a tube's worth of RTV sealing it. Placing it on the plenum and a flat surface to check, it definitely "bounces". Pushing one end flush raises the other end about 1/16 to 1/8 an inch. From what I read you used to be able to exchange these with Accel for a billet lid, but I don't think that's an option anymore...

The only options I can think of are to either deck the whole lid surface flat, or drill and tap an extra set of holes and double the screw count, doing what the prototype Superram did with its lid. Do either of these seem like viable solutions?
can check with a straight edge on top and base to see where the problem is
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