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

Valve cover options for lt1/4 Help ?

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Old Feb 24, 2006 | 12:38 AM
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Default Valve cover options for lt1/4 Help ?

having issues deciding on a cover set. seems most sets wont fit because of the alternator bracket etc. are there any out there that are designed specifically for an lt1/4 ??? Plz help if you know any !
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Old Feb 24, 2006 | 01:18 AM
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I thought exotic muscle had some... or TPiS... also check superior chevy, www.superchevyperformance.com
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Old Feb 24, 2006 | 01:53 AM
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The ones on Ebay also state that they have been notched for the correct bracket.

Check the 2nd picture on that auction

Ebay Valve Cover Link
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Old Feb 24, 2006 | 02:02 AM
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Originally Posted by bogus
I thought exotic muscle had some... or TPiS... also check superior chevy, www.superchevyperformance.com
I've been looking for a fancy set for my 95 LT1 and checked out SCP however unless I read it all wrong the only ones that they have that are properly notched is a set of black plastic ones that look just like the original equipment.

I saw the ones on e-bay also but IMHO they looked kind of crapy in the pics.
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Old Feb 24, 2006 | 02:31 AM
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I'm using Proforms, no alternator bracket isses to speak of...

Mo
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Old Feb 24, 2006 | 03:39 AM
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Proforms.. from where? would appreciate any info on them. GMPP has some nice ones but not sure if they are specific for the corvette because of the notch.. as shown in the link. As for exotic muscle i had looked at them earlier and planned on calling them tommorow.

thanx for the info so far !
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Old Feb 24, 2006 | 03:42 AM
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12497985 From superchevy performance are the ones i would hope will fit. knowing they are 1/4 inch higher will help clear the shaft rockers i have but i dont know if the valve cover is notched for the alternator.

I googled proform covers.. and came up with a link to sallee-chevrolet. the covers seem to be the same as above with the same part number except for a 5 added to the end so im guessing theyre the same. it says this:

Note: This valve cover will not work with 1993 through 1997 Camaro LT-1’s. The alternator bracket gets in the way.
See Standard -VS- Proform valve covers for differences between these valve covers.

Im hoping that this means it 'will' fit the corvette.. but i was under the impression the corvette alternator was the one that was in the way..

Last edited by DieL; Feb 24, 2006 at 03:49 AM.
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Old Feb 24, 2006 | 06:43 AM
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Originally Posted by Trizney
The ones on Ebay also state that they have been notched for the correct bracket.

Check the 2nd picture on that auction

Ebay Valve Cover Link

If you have an F-body with the Alt mounted on the pasangers side those will work great but not on the C4. I have a set of the billit ones without the notch and had to carve up my Alt but just installed a set of stockers and will be knotching the billit one soon.
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Old Feb 24, 2006 | 10:44 AM
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Originally Posted by DieL
12497985 From superchevy performance are the ones i would hope will fit. knowing they are 1/4 inch higher will help clear the shaft rockers i have but i dont know if the valve cover is notched for the alternator.

I googled proform covers.. and came up with a link to sallee-chevrolet. the covers seem to be the same as above with the same part number except for a 5 added to the end so im guessing theyre the same. it says this:

Note: This valve cover will not work with 1993 through 1997 Camaro LT-1’s. The alternator bracket gets in the way.
See Standard -VS- Proform valve covers for differences between these valve covers.

Im hoping that this means it 'will' fit the corvette.. but i was under the impression the corvette alternator was the one that was in the way..
It takes a litle work to make the Proforms fit the LT1. Put a couple washers under the alt brace to raise it, and grind on the back of the alternator a bit so it clears the front of the valve cover.

But what matters to you, I'm not sure they will clear the shaft rockers you have. They aren't all that tall.

I have the 7978 over the Crane 1.6 rrs. Not too sure about your shaft rockers clearing.
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Old Feb 24, 2006 | 04:39 PM
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Might i ask if anyone can take a quick pic of the drivers side valvecover/aternator area. just to get an idea what is getting in the way.
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Old Feb 24, 2006 | 05:45 PM
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I used the polished aluminum Morosos. I ground the rear of the alternator housing for clearance. The rear alt. bracket itself was no problem. They clear my 1.6 Pro Magnum RRs w/ no problem. Although it doesn't give a lot of detail or even a view of the driver's side, click on 'My Corvette Photos' to see what they look like on the LTx engine. I opted to omit the fuel rail covers after installing them since my intake's cleaned, detailed and smoothed.
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Old Feb 24, 2006 | 06:00 PM
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Originally Posted by DieL
Might i ask if anyone can take a quick pic of the drivers side valvecover/aternator area. just to get an idea what is getting in the way.
I have a picture of mine with the polished aluminum covers here on Putfile Alternator fitment with Proform

You can't see where I ground on the alternator for clearance. You could do the job with a flat file by hand if you had no grinder, it's that simple. What you modify is totally out of sight.
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Old Feb 24, 2006 | 06:41 PM
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Originally Posted by FELNGR8
I have a picture of mine with the polished aluminum covers here on Putfile Alternator fitment with Proform

You can't see where I ground on the alternator for clearance. You could do the job with a flat file by hand if you had no grinder, it's that simple. What you modify is totally out of sight.
thanks for the pics ! im getting an understanding of why they didnt fit. so it isnt the actual bracket but the alternator itself? in your pic with the washers this puts the bracket above the cover right?
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Old Feb 24, 2006 | 06:50 PM
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Originally Posted by FELNGR8
I have a picture of mine with the polished aluminum covers here on Putfile Alternator fitment with Proform

You can't see where I ground on the alternator for clearance. You could do the job with a flat file by hand if you had no grinder, it's that simple. What you modify is totally out of sight.
That is pretty much what I did with my GM covers.
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Old Feb 24, 2006 | 08:24 PM
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That is a great pic and it explains a lot just keep in mind that is for the Proforms. If you select another VC it may require a lot more grinding. My billit covers required the altenator to be ground all the way through the case and it still hit. I did not have a set of stockers at the time and was in a bind and the grinder was handy. I have a set of stockers on there at the moment and will be moding my billit covers to fit but a cutting wheel and welder will be used for the mod. THe Proforms have almost the same shape as the stockers (The corners are sharp and not rounded) and they look great, Hmm the more i look at them the more I am thinking they might be a good place for the tax check
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Old Feb 24, 2006 | 08:56 PM
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Originally Posted by DieL
thanks for the pics ! im getting an understanding of why they didnt fit. so it isnt the actual bracket but the alternator itself? in your pic with the washers this puts the bracket above the cover right?
The bearing boss at the rear of the alternator hits the front end of the valve cover, so that it won't rotate completely to bolt up properly. You have to grind on the back of the alternator housing to get clearance here. The grind is not shown because it's out of sight, and I'm not taking ir off just to get pictures now.

The bracket also hits the valve cover if you do nothing special. The washers lift the inner end of that bracket enough to clear the valve covers, yes.

On the 92-93 cars this is all that has to be done. On 94-96 you have to do something about moving the crank vent hose from the side of the stock cover to the middle of the Proform cover. Jeff Kopp at Superior checked it out and sold me a crank vent hose for a 92 model that snakes up over the valve cover. I ground into the plastic fuel rail cover to make clearance for that hose. This issue is on the passenger side of 94-96 cars only. On 92-93 cars the passenger side fits correctly.

I have a picture here of the end result on the passenger side Passenger side valve cover

Last edited by FELNGR8; Feb 24, 2006 at 09:17 PM.
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Old Feb 24, 2006 | 09:29 PM
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Check out the valve covers at Lingenfelter. I don't know if they need any modification, but they are reasonably priced and look cool.
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Old Feb 25, 2006 | 12:57 AM
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Originally Posted by FELNGR8
The bearing boss at the rear of the alternator hits the front end of the valve cover, so that it won't rotate completely to bolt up properly. You have to grind on the back of the alternator housing to get clearance here. The grind is not shown because it's out of sight, and I'm not taking ir off just to get pictures now.

The bracket also hits the valve cover if you do nothing special. The washers lift the inner end of that bracket enough to clear the valve covers, yes.

On the 92-93 cars this is all that has to be done. On 94-96 you have to do something about moving the crank vent hose from the side of the stock cover to the middle of the Proform cover. Jeff Kopp at Superior checked it out and sold me a crank vent hose for a 92 model that snakes up over the valve cover. I ground into the plastic fuel rail cover to make clearance for that hose. This issue is on the passenger side of 94-96 cars only. On 92-93 cars the passenger side fits correctly.

I have a picture here of the end result on the passenger side Passenger side valve cover

amazing.. ty for all the input !! those pics really help out ! as for lingenfelter the shoppe im dealing with doesnt want lpe covers on it i did call them anyhow and they directed me to street performances website. after calling them 3 different people gave me quotes of $75 $100 and $150 to modify any centerbolts to specifically fit my car ( by cutting /welding ).

those proforms were what i had my eye on.. and will probably be what i go with . ill get pics up soon of the entire build up. excited its coming to an end !
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Old Feb 25, 2006 | 01:11 AM
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Originally Posted by FELNGR8
The bearing boss at the rear of the alternator hits the front end of the valve cover, so that it won't rotate completely to bolt up properly. You have to grind on the back of the alternator housing to get clearance here. The grind is not shown because it's out of sight, and I'm not taking ir off just to get pictures now.

The bracket also hits the valve cover if you do nothing special. The washers lift the inner end of that bracket enough to clear the valve covers, yes.

On the 92-93 cars this is all that has to be done. On 94-96 you have to do something about moving the crank vent hose from the side of the stock cover to the middle of the Proform cover. Jeff Kopp at Superior checked it out and sold me a crank vent hose for a 92 model that snakes up over the valve cover. I ground into the plastic fuel rail cover to make clearance for that hose. This issue is on the passenger side of 94-96 cars only. On 92-93 cars the passenger side fits correctly.

I have a picture here of the end result on the passenger side Passenger side valve cover
final question about that vent hose. on my 93 if i remember corect theres a hose that goes on the side of the valve cover as well.. going to dig up a pic..

heres one


appears i would need to have the same hose as well.
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Old Feb 25, 2006 | 01:24 AM
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Mine are proform PRO-141-130 I got them from summit racing... 129 dollars...

I have photos on my site.... see signature.. it under LT4 396...

I did have to slightly grind the boss on my alternator, but i wasnt a whole lot...

I didn't have to grind or use washers on thealternator bracket...

Mo
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