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

new opti suggestions

Old Jan 27, 2008 | 06:09 PM
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Default new opti suggestions

well i took my opti apart today while the motor is out, and it is corroded pretty bad. i suspected something might have been wrong because it was missing very slightly at about 5600-5700 rpms. the sad thing is that the cap and rotor are only 3000 miles old (cheap summit unit). the original opti, which made it to 72000 miles, did the same corroding and arcing.

anyway, i need a new one within the week and was wondering my best option for less than $150.

i was looking at a few options

1) get an msd cap and rotor
2) get this entire opti which i think is an ac delco unit http://cgi.ebay.com/ebaymotors/OEM-L...spagenameZWDVW

the only thing with the ebay one is that it says its vented and mine is currently not. could i use that one and just plug off the vent or something?

3) your guys suggestions

i did a search on the matter, which was somewhat helpful, but still want your opinion. thanks
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Old Jan 27, 2008 | 06:12 PM
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Get the MSD cap and rotor, it will copnvert it too vented and more than likely solve the corrosion problems.

The unvented ones build up ozone which is the source of corrosion, venting stops the buildup.
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Old Jan 27, 2008 | 06:19 PM
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but wont i have to run vaccum lines of some sort to convert it?
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Old Jan 27, 2008 | 07:11 PM
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^I don't think you will have to, as far as i know(correct me if im wrong) you can just put it in and not have to modify anything.
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Old Jan 27, 2008 | 07:18 PM
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Originally Posted by 96capricemgr
Get the MSD cap and rotor, it will copnvert it too vented and more than likely solve the corrosion problems.

The unvented ones build up ozone which is the source of corrosion, venting stops the buildup.
I think you might have missed that his current opti is corroded. I think that this eliminates replacing just the cap.

i would consider that opti on ebay but first i would ask for more pics of the cap i have heard that there are companies that are selling "oem" optis with black caps ie not oem

l would go with this tho

https://ls1tech.com/forums/showthrea...highlight=opti
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Old Jan 27, 2008 | 07:28 PM
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Originally Posted by LT1Falcon
but wont i have to run vaccum lines of some sort to convert it?
Actually I think MSD supplies the lines, yes you would have to plumb them but this is the fix. Like I said the arcing produced ozone and that is the cause of the corrosion.

Since it ran just with a miss it sounds to me like it is just the cap and rotor that corroded. Maybe elaborate so we are clear.

The opti hate you find on these boards is not born in reality but rather internet stupidity.

The unvented did leave something to be desired hence the redesign, MSD came up with a simple effective way for you to upgrade to vented without having to change bases and timing covers and such.
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Old Jan 27, 2008 | 07:36 PM
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actually its just the cap that has corrosion and arcing. that is a good deal for 75 dollars, but im leaning towards what caprice is saying in that i should convert to vented. i take it the vacuum lines just run to the intake manifold?
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Old Jan 27, 2008 | 07:55 PM
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Personally, I would avoid that EBay opti.

Thepartsladi on EBay supposedly carries authentic AC/Delco optis. I think they also carry Delphi, which are supposedly the same thing. Some of the Delphi pics appear to have black caps. I would want to get an explanation for that before buying one because there are a lot of EBay vendors trying to pass off optis with black caps as authentic AC/Delco optis when they aren't.
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Old Jan 27, 2008 | 08:50 PM
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One vacuum line runs to the intake tract somewhere between the filter and TB for a fresh air pickup. The other one runs to one of the plenum vacuum ports.
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Old Jan 27, 2008 | 11:41 PM
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Originally Posted by BTC
Personally, I would avoid that EBay opti.

Thepartsladi on EBay supposedly carries authentic AC/Delco optis. I think they also carry Delphi, which are supposedly the same thing. Some of the Delphi pics appear to have black caps. I would want to get an explanation for that before buying one because there are a lot of EBay vendors trying to pass off optis with black caps as authentic AC/Delco optis when they aren't.
I purchased one from them about 2 months ago. It came with the yellow cap and in the original delphi box. i think i paid 200. Cars been running great...
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Old Jan 27, 2008 | 11:45 PM
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If you are converting to a vented opti you need a longer pin on the cam and you will need a wiring harness because it is different. just be aware of this before buying parts.
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Old Jan 28, 2008 | 12:11 AM
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Originally Posted by Bad93TA
I purchased one from them about 2 months ago. It came with the yellow cap and in the original delphi box. i think i paid 200. Cars been running great...
Cool. In some of their pics, the cap on the Delphi units looks like it could be black, but it's hard to tell. The Delphis are a little cheaper. I wonder if part of what's been going on between GM & Delphi allows them to market more of their products directly to the consumer under their own brand. That's just a wild guess because I've only recently been seeing Delphi optis.
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Old Jan 28, 2008 | 12:39 AM
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just so everyone knows he is not talking about doing a conversion to a vented opti. the msd cap kits are made to vent a non vented opti.
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Old Jan 28, 2008 | 06:08 AM
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Originally Posted by procharged355
If you are converting to a vented opti you need a longer pin on the cam and you will need a wiring harness because it is different. just be aware of this before buying parts.
so even if i use the msd cap and rotor on my old base i will still need this? dont see why i would.

and caprice, if thats all i need to run thats no big deal, ive run quite a few lines on this car already
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Old Jan 28, 2008 | 02:21 PM
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so is this the kit i need?

http://store.summitracing.com/partde...5&autoview=sku

i need to know by tonight so i can order it, thanks
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Old Jan 28, 2008 | 03:15 PM
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http://store.summitracing.com/partde...5&autoview=sku

The one you linked too was the 95-7 one, this is the 92-4 one.

Just to be clear the b-bodies got the later vented one in 94 it was just the Vette and f-body that had this unvented in 94. Creates some confusion sometimes.
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Old Jan 28, 2008 | 03:55 PM
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Originally Posted by LT1Falcon
so even if i use the msd cap and rotor on my old base i will still need this? dont see why i would.

and caprice, if thats all i need to run thats no big deal, ive run quite a few lines on this car already
No you don't need a longer pin if you run the msd cap/rotor kit. And just a heads up, if the washers that come with the kit don't fit go out and buy some that do.
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Old Jan 28, 2008 | 08:12 PM
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ok thanks guys
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Old Jan 28, 2008 | 08:30 PM
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Originally Posted by 96capricemgr
http://store.summitracing.com/partde...5&autoview=sku

The one you linked too was the 95-7 one, this is the 92-4 one.

Just to be clear the b-bodies got the later vented one in 94 it was just the Vette and f-body that had this unvented in 94. Creates some confusion sometimes.
thanks for the link, but how do you know its for the 93? when i go to "make sure it fits your application" part, it looks the same as the other one, and acts like its for a 95 and up. your probly right but just wondering how you know
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Old Jan 28, 2008 | 09:59 PM
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JEGS lists the 8481 as the cap & rotor for 93's-94's and the 84811 for 95's-97's. And as a matter of fact, Summit's site says the same thing when I check to see if the part fits my application.
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