captbob33

Trying to find two parts for my 96 LT1. Mounted in-line on the opti-spark vacuum hose (hose to manifold) their are two small plastic parts,
one is called a "CHECK VALVE" and the other is called a "CHECK VALVE/ FILTER". Both have barb fittings that slides into the vacuum hose. Can anyone tell me where I can purchase these parts, either new or used? I'm having no luck what so ever!
The complete vacuum line harness (GM part no. 12558921) has been discontinued by GM. I don't need the complete harness, only the two parts described.
Appreciate any help.

96polovette

Me too. Can anyone suggest where to get this part? There must be some aftermarket replacement but I can't find anything or figure this out.

corvette Stu

Contemporary Corvette in Bristol Pa. Large Corvette salvage yard.

WVZR-1

You should have no issues purchasing the check valve (that's a one way device) at any auto parts store or dealer, the other is a valve/filter but a restrictor might be a better description to limit the vacuum. There's many of those with various sized orifices and the OE likely did/does contain a filter.

Do you know that you need both? I would think you could check the restrictor for function and actually you could check both.

An RC car fuel filter should likely work as a filter if you felt you needed a filter but as far as restriction I don't know, there's restrictors used in the boost gauge lines for nearly all "super-charged" cars, orifice sizes vary. There's an after-market also available from Dorman but with no filter.

I'd be tempted to try this GM 10207729 vacuum restrictor that would likely have a filter also.

96polovette

Thanks for the info. When I purchased the car about 7 years ago it was missing. I plan to put a new water pump and opti spark in it this spring. I would like to have the new opti spark ventilated and connected to the proper vacuum harness to ensure it lasts.

I don't know much about the part, I have not even examined one close up. I only know that the vacuum line in the harness runs from the opti spark up into the top of the air intake inlet. It is my understanding that it was put on the 1995 and 1996 corvettes to keep the opti spark drier. I am really irritated with GM discontinuing the production and availability of parts and the lack of an aftermarket replacement.

96polovette

I called Contemporary Corvette. They sell their engines complete, they generally don't part out engine components.

mtwoolford

a lot of that little stuff, check valves, filters is just generic; try looking for similar year items in emissions and HVAC, or air conditioning parts catalogs or at a local parts store; for instance on my 96, I replaced the filter you're looking for with a very small fuel filter which tucked up nicely under the plastic engine cover and the check valve was a generic check valve (looked identical) for an A/C system straight off the parts rack with all the other little doodads.

Paul Workman

Try calling Jason at Vette2Vette. He's a great guy to do business with.

96polovette

Message sent.

tlong

Jason is a great guy and will help you if possible with low prices and fast shipping.

Williamlindsey

try Ajax on 24 hwy in independence mo.

96polovette

I found one! 9 more are available.

http://www.ebay.com/itm/1995-1997-LT-1-LT-4-Opti-Spark-Distributor-Vacuum-Harness-/321336665395?pt=Motors_Car_Truck_Parts_Accessories&hash=item4ad1286533&vxp=mtr

WVZR-1

That is NOT an OE but he does say it's got the correct orifice so who knows. Some of his products don't seem to do very well maybe this actually is an OK deal. He will have those all of the time. It certainly saves time in sourcing the filter and check valve but it's NOT a deal.

Klyde

Last year I discovered that one of the pulleys had cut through one of the Opti purge hoses on my 96'. I was going to just replace it but once I saw how hard that was to get to I just decided to cut out the bad section and connect the two pieces with a vacuum hose barbed connector. I was in the "Help" parts section at Advancedautoparts looking for the correct sized barbed connector and found an identical check valve and inline filter to the ones in the purge hose. I had them in my pocket just incase I could find them. I had looked for both parts on their internet site but they do not have the filter listed, but did show a check valve that looked close. The "Help" section is just a bunch of those odd little pieces that you always seem to need. Before you spend big bucks and lots of time just swing in and see what your local parts store has. I believe both Autozone and AdvancedAutoParts have the "Help" sections.