rklessdriver

No hacking up anything.

The "modifying" is poking a hole in the air cleaner duct (so you can install a plastic vaccum fitting) and "T" ing into a vaccum line off the intake manifold. Instructions are included with MSD.
Will

mfi

What about hooking up the wiring harness..does MSD plug in or need modifying?

dizwiz24

Doubt it, if anything its worse.

The orig. Founder of msd sold the company sometime in the past decade.

Someone bought it just for the name (which is rapidly fading ).

Too much risk.

dizwiz24

OK, I edited my post because I was trying to find a bunch of the bad posts about msd optispark I seem to remember.

I couldnt find them. Id try looking for them.


So take my comments with a grain of salt. I wouldnt trust an MSD optispark.

timmy 93

I have an MSD also. I believe their issues are in the past.The warranty is one year and they stand behind it. Cheap Optis on E-bay and elseware are just junk. Tim

xole

I replaced mine with a Delphi from Specialty Parts (uses same source as thepartsladi) and MSD makes a cap kit that converts it to be vented (MSD-8481).

No problems at all.

I will say that I had to call MSD to ask their tech support a question and it was very scary. I would never purchase a MSD Opti based on their knowledge level.

93VettePilot

CMS Chandler motorsports eBay with lifetime warranty

mfi

Read this one is 50/50 on the reliability scale.
The prob is that I don't want to have to do this job again..as its a bitch to do..so even if they warranty the part for life..its the install thats killer..
ok..enough people have said the MSD is junk.
Seems the delphi is the way to go..just have to convert it to vented..msd cap..have to look that up. i want the best one possible and am willing to spend the money.
The shop next door..well once they diagnosed it as an opti issue (broke down right in front of their door so I figured I'd let them check it out) didn't want to do the job! had to have it flatbedded..to my GF's driveway where all my tools are..NEVER had a shop turn down a job before!
Damn I miss my 72 GTO...

rklessdriver

It will require a small amount of re-wire.

MSD actually did a good thing when the built their opti by incorporating the Opti pig tail lead (harness) all the way up to the engine harness under the fuel rail cover.... GM uses a 2 peice Opti pig tail harness (connects at the Opti and again under the fuel rail ocver) and it often gets damaged. So MSD thought it would be a good idea to make the harness only have 1 connection (the one under the fuel rail cover).

Problem with the 92 Corvette is that as a first year car some things are different and that connector has 5 wires instead of 4 wires like the 93-97.

2 ways to fix it.

1. Cut the wires and solder them as per the included MSD instructions.
2. Buy the 93-97 4 wire harness weather pac connector and re-pin your harness to the 4 wire set up. I did it this way. The 5th wire is just an unused shielded ground wire you tape up in the harness. You can get the weather pac connector at efi connection for about $10.00
Will

xole

I replaced my water pump as well and added a drain for the weep hole. One of those while you have it apart and never want to do it again things.

I would have replaced plug wires as well if I had not already done them recently.

93VettePilot

It also is no fun to do it again and have to pay again...lol

mfi

OK..need sleep..but:
I'm going with a real ac delco from summit..yeah its expensive but has the best reviews about reliability..but: I want to vent it but don't want to cobble that together. i know there is a real kit to do it but can't find it..does the MSD cap for the 93-94 fit, that seems the best one?

rklessdriver

You need PN 8481 (as xole already stated).

Here are the install instructions.

http://www.jegs.com/InstallationInst...1/121-8481.pdf
Will

mfi

Hmm.found a new acdelco with the vent kit installed at Corvette central..they claim its an oem unit..going to call them...weird how they sell a vented and nonvented one for the same price...
And they say its the same one just modified....guess I'll roll the dice...

mfi

Well I think I'm done buying all the crap I need:
moded/vented opti
water ,opti seals
plugs, wires,gaskets
most important..or so I found out. A water pump seal tool, custom made just for the job from ebay.
top radiator hose, need one, new air filter..what the hell..
so far I've spent $680.00...shops want almost $1500.00 for the job..figure I can pay myself the grand in labor...

Charleston2012

Do lower radiator hose also.
I also use Permatex, The Right Stuff. Excellent RTV

JackDidley

I was going to suggest something like this.

cv67

funny thing is thats probably more reliable.
Taking the dist. out of the LTx was a stupid idea.

mfi

If that an sx650..been there...used to build all kinds of bikes..much easier to deal with than this thing...

Charleston2012

Someone on here has converted to a regular distributor on their LT1.
Optis are hit and miss. More miss for me. I use DELTEQ and just the optical sensor with a rotor shaved/cut down just to hold the plate in there for referencing the Optical sensor.