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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Cap and rotor question

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Old Feb 1, 2009 | 07:01 PM
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Default Cap and rotor question
is there any difference between a 93-95 cap and rotor compared to a 96-97 cap and rotor?
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Old Feb 1, 2009 | 07:04 PM
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93-94 are the same and 95-97 are the same. The early ones are not vented.
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Old Feb 1, 2009 | 07:29 PM
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in theory, could someone use a 95-97 cap, plug the holes in the bottom of the opti, and make a ghetto vented opti?
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Old Feb 1, 2009 | 07:54 PM
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Originally Posted by ElkySS
in theory, could someone use a 95-97 cap, plug the holes in the bottom of the opti, and make a ghetto vented opti?
Maybe, but I doubt it. Just get the MSD if you want one with pre-made line fittings. I'd find a spot you can drill a hole at and glue in a plastic vacuum barb. Alone with siliconing the bottom of the cap to extra insurance.
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Old Feb 1, 2009 | 08:03 PM
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are you talking about the opti shbox? the cap and rotor i want to put on my 96 is off a 94 wanting to make sure it will work and that they are the same. im not using his opti because mine is still good. i just broke my rotor. so is cap and rotor the same?
Last edited by 1996camaross; Feb 1, 2009 at 08:22 PM.
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Old Feb 1, 2009 | 08:42 PM
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Originally Posted by ElkySS
in theory, could someone use a 95-97 cap, plug the holes in the bottom of the opti, and make a ghetto vented opti?
Yes (but you don't plug the holes). http://www.corvettefever.com/howto/16758/index.html

Originally Posted by 1996camaross
are you talking about the opti shbox? the cap and rotor i want to put on my 96 is off a 94 wanting to make sure it will work and that they are the same. im not using his opti because mine is still good. i just broke my rotor. so is cap and rotor the same?
You asked about cap and rotor only. That is what I replied to. If you use the old cap, you won't have a vented system. IMO, don't.
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Old Feb 1, 2009 | 09:06 PM
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Originally Posted by shbox
Yes (but you don't plug the holes). http://www.corvettefever.com/howto/16758/index.html



You asked about cap and rotor only. That is what I replied to. If you use the old cap, you won't have a vented system. IMO, don't.
even if the cap is msd? still not vented?
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Old Feb 1, 2009 | 09:08 PM
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Originally Posted by shbox
Yes (but you don't plug the holes). http://www.corvettefever.com/howto/16758/index.html
The other option being to use an MSD cap and rotor ($150) to convert a 93-94 to Vented.
I did mine when I did the 383 build.
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Old Feb 1, 2009 | 09:28 PM
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Originally Posted by 1996camaross
even if the cap is msd? still not vented?
You did not say MSD before, lol. You were talking about a pre-95 cap you had (not specified as MSD). MSD has their own venting system for early optis. You should probably go to their website and look it up.
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Old Feb 1, 2009 | 10:54 PM
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Originally Posted by shbox
You did not say MSD before, lol. You were talking about a pre-95 cap you had (not specified as MSD). MSD has their own venting system for early optis. You should probably go to their website and look it up.
yea my bad. i talked to a buddy that im getting it from and he also said it was vented . thanks for the info man.
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Old Feb 2, 2009 | 12:54 AM
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well if the little holes dont get plugged, wouldnt that lead to a vacuum leak?
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Old Feb 2, 2009 | 07:00 AM
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Originally Posted by ElkySS
well if the little holes dont get plugged, wouldnt that lead to a vacuum leak?
Refer to the link to the tech article I posted.
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