Spark Delay Check Valve
Thread Starter
Instructor
Joined: Aug 2012
Posts: 160
Likes: 3
From: Bellevue Nebraska
NE Events Coordinator
Spark Delay Check Valve
1979 L48. Seems I am missing the Spark Delay Check valve, seems this is a discontinued item. Comes off the second TVS switch (blue ports) on the thermostat housing, two lines from TVS and one side to carb vacuum the other to vacuum advance on the dizzy.
Two questions...
Do I need it? If so, does anyone have one they want to get rid of or is there a work around for it?
Thanks in advance.... JB
Two questions...
Do I need it? If so, does anyone have one they want to get rid of or is there a work around for it?
Thanks in advance.... JB
Thread Starter
Instructor
Joined: Aug 2012
Posts: 160
Likes: 3
From: Bellevue Nebraska
NE Events Coordinator
Thanks speed, do you know if this is closer to the actual one? looks like the pic in the AIM but vette isn't listed.
http://www.carpartkings.com/standard...lve-dsv11.html
thanks again, jb
http://www.carpartkings.com/standard...lve-dsv11.html
thanks again, jb
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Get the P/N for your needed part from the AIM. Then take that list of vehicles for the carpartkings part (particularly the 1979 Chevys) to the Parts Counter of a Chevy dealership and ask them to look up the P/N for that piece on vehicles in that list.
When one of them is the same as the P/N you need for your Corvette, just order the 'sister' part from carpartkings.
P.S. Since that part is discontinued from the GM supply chain, you can explain your situation to the Part Counter person. If they're not terribly busy at the time, they should be glad to help you out.
P.S. Please remember to come back to this thread to post the details of the 'sister' part you found, so others can benefit from your research.
When one of them is the same as the P/N you need for your Corvette, just order the 'sister' part from carpartkings.
P.S. Since that part is discontinued from the GM supply chain, you can explain your situation to the Part Counter person. If they're not terribly busy at the time, they should be glad to help you out.
P.S. Please remember to come back to this thread to post the details of the 'sister' part you found, so others can benefit from your research.
Last edited by 7T1vette; Aug 14, 2013 at 03:08 AM.
Thread Starter
Instructor
Joined: Aug 2012
Posts: 160
Likes: 3
From: Bellevue Nebraska
NE Events Coordinator
Ok, gonna remove the Spark Delay and the EFE is already gone. I'm a visual type of person, so... does this look correct for headlight and emission connections (tired of looking at 6 different pages in the AIM)? I know the colors aren't correct but they where easy to follow.
Burning Brakes
Joined: May 2013
Posts: 789
Likes: 129
From: Los Banos CA
Hi All - first post, but I've been using the forums for the last 6 months to put together a 79 'project' with my son.
I'm in the same boat as jbrown8238 - looking for the spark delay check valve. Unfortunately, I need it for emissions, so I can't just leave it off. The E-Bay listing above seems to fit 4 cyl engines, so not sure if that would work or not.
I tried the suggestion posted by 7T1vette, but the AIM doesn't seem to list the part number of the check valve (but I did find the diagram showing it) - are part numbers listed in some hidden section of the AIM?
The part on CarPartKings (red/black) looks to physically be a match, but the applications are mostly trucks. Doc Rebuild shows a green/black valve that looks identical, but he does not have any in stock.
Anyway, after some extensive use of google (couple of hours), I THINK a more appropriate part might be GM #476330 (DSV20), but is still probably not the 100% correct part?. It matches physically, fits 6 cyl and some 8 cyl in 1979/80 (although listed for Camaro, El Camino, Caprice, etc, but not Corvette).
Here is what I found, in case anyone else finds it useful. If anyone knows the actual GM part number of this part on a 79 with fed emissions, let me know.
http://www.gmpartswiki.com/getpage?pageid=96803
http://www.oehq.com/oeparts_476330.htm (lists some possible P/N of other aftermarket manufacturers)
I'm in the same boat as jbrown8238 - looking for the spark delay check valve. Unfortunately, I need it for emissions, so I can't just leave it off. The E-Bay listing above seems to fit 4 cyl engines, so not sure if that would work or not.
I tried the suggestion posted by 7T1vette, but the AIM doesn't seem to list the part number of the check valve (but I did find the diagram showing it) - are part numbers listed in some hidden section of the AIM?
The part on CarPartKings (red/black) looks to physically be a match, but the applications are mostly trucks. Doc Rebuild shows a green/black valve that looks identical, but he does not have any in stock.
Anyway, after some extensive use of google (couple of hours), I THINK a more appropriate part might be GM #476330 (DSV20), but is still probably not the 100% correct part?. It matches physically, fits 6 cyl and some 8 cyl in 1979/80 (although listed for Camaro, El Camino, Caprice, etc, but not Corvette).
Here is what I found, in case anyone else finds it useful. If anyone knows the actual GM part number of this part on a 79 with fed emissions, let me know.
http://www.gmpartswiki.com/getpage?pageid=96803
http://www.oehq.com/oeparts_476330.htm (lists some possible P/N of other aftermarket manufacturers)
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski