MSD Optispark
Just drill a small hole in your elbow and run the other cap vent with the "T" and check valve provided into a vacuum port on your manifold. Viola - instant vented opti.
Don't cap the hole! The defeats one of the biggest benefits of an MSD cap on a 92-94, the cheap conversion to vented.
Just drill a small hole in your elbow and run the other cap vent with the "T" and check valve provided into a vacuum port on your manifold. Viola - instant vented opti.
Just drill a small hole in your elbow and run the other cap vent with the "T" and check valve provided into a vacuum port on your manifold. Viola - instant vented opti.
TECH Veteran
Joined: Dec 2008
Posts: 4,144
Likes: 61
From: Little Rock, AR
I thought the things came with complete instructions on how to run the vent hoses. They are on MSDs website.
http://www.msdignition.com/instructi...pdf?terms=8381
http://www.msdignition.com/instructi...pdf?terms=8381
Don't cap the hole! The defeats one of the biggest benefits of an MSD cap on a 92-94, the cheap conversion to vented.
Just drill a small hole in your elbow and run the other cap vent with the "T" and check valve provided into a vacuum port on your manifold. Viola - instant vented opti.
Just drill a small hole in your elbow and run the other cap vent with the "T" and check valve provided into a vacuum port on your manifold. Viola - instant vented opti.
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If the guy were capable of searching the web for information he would have realized the MSD opti is a bad thing, much more expensive and less reliable than stock.
The cap and rotor kit is nice and would have allowed the conversion to vented that the one rocket scientist here is saying not to do.
The cap and rotor kit is nice and would have allowed the conversion to vented that the one rocket scientist here is saying not to do.
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I love my MSD opti 
TECH Enthusiast
Joined: Mar 2009
Posts: 680
Likes: 7
From: Clearwater
2. the MSD opti has only been around since what? 2006? is that even enough time for it to get the same 100k mile treatment as the GM ones?
MSD have great quality products and racers of all levels have proven their products performance. I'm sure their R&D team did their homework when they made their LT1 optisparks.
TECH Enthusiast
Joined: Jun 2002
Posts: 634
Likes: 0
From: In the garage fixing LT1
It is important to install the vents because they remove several things from the distributor, including seeping oil from the timing chain cover, acidic gases that result in premature failure, smoke that can obscure the laser, and any moisture that may accumulate. Make sure you check the optispark vent hoses for leaks on a regular basis because if they crack your MSD will suck up water in a rain storm and the car will stall out.
Some guys don't like the vented optis. My first unvented opti lasted 90,000 miles, no leaks. I have found in most cases optis fail because of bad installation, and leaky hoses.
