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#1 |
Senior Member
![]() Join Date: Sep 2002
Location: Hampstead, NC
Posts: 8,187
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Can someone tell what this does?
The part in question is the piece that is mounted on top of the thermostat housing. Two vacume lines hook to it. The one on my 76 454 is broken and I'd like to know if I can eliminate it or if it should be replaced. BTW the air pump on mine has been removed, not sure if it is related but thought I would mention it.
Thanks for any info. |
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#2 |
Account Suspended
Join Date: Mar 2005
Posts: 453
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Never seen one of those. Kinda strange.
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#3 |
ureckmefixit2@cox.net
Join Date: Dec 2004
Location: Mesa AZ. (Phoenix)
Posts: 1,284
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Its a themostat housing w/ a thermo vacume switch. It might go to your EGR? not enough info. Matt
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That's U RECK ME FIX it 2 74 Chevy Short Bed 355ci Sportsman II 64cc Angle Plug Crower Custom Grind .462in .486ex Dyno Test 422hp @ 5600 And it's got a Holley 3.73 Gears 12 Bolt 3.73 w/Posi 700R4 Going In I'm a Body Man So There! That's why it's not painted |
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#4 |
Registered User
Join Date: Jan 2005
Location: beaumont,tx
Posts: 757
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not sure but my 78 doesnt have it or it did and broke off but i dont think u need it
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#5 |
needin' money
Join Date: May 2005
Location: Chickasha, Oklahoma
Posts: 1,106
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eliminate it
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SWB Stands for Short Wide Bed |
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#6 |
its just $$$$$
Join Date: Jul 2003
Location: OK
Posts: 2,078
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EGR parts, just scrap it.
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#7 |
Registered User
Join Date: Dec 2004
Location: New Lenox, IL
Posts: 442
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Does it go to the thermostatic air cleaner or heat riser? I think it might.
-Jeremy |
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#8 |
Gettin It One Pice At A Time
Join Date: Oct 2004
Location: everett, washington
Posts: 2,688
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my 79 has one like that just has more ports. if you scrap it how do you re-rout the vacume likes? I actualy have two ports like that. the other is on the manafold and is kinda purple.
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RIP ELJAY ![]() ![]() Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby |
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#9 |
Registered User
![]() Join Date: Apr 2004
Location: Sacramento
Posts: 3,737
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mine has 4 ports on my '81.
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#10 |
Registered User
Join Date: Apr 2005
Location: Tulsa Oklahoma
Posts: 943
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i believe it is in relationship with the ???/heatriser???? something or nother to work a smog control unit of some sort basically scrap it and plug the lines that connect to it as well these truck had a lot of vacuum lines originally and they run like crap with them all there imo.
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square body trucks an addiction or an investment either way they consume all my extra time and money |
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#11 |
Professional Beer Tester
Join Date: Aug 2004
Location: Louisiana
Posts: 453
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On the 454's that we used to have in our fleet(about 60 at one time) that switch was used to regulate the distributor vacuum advance. As I recall, it would switch the advance from ported vacuum to manifold vacuum or vise versa when the engine warmed up. Like everyone else said, it's not necessary. Just make sure the vacuum advance is hooked up.
60-66 Nut
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#12 |
Registered User
Join Date: Oct 2002
Location: Phoenix, Arizona
Posts: 4,703
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Thermal vacuum switch.
It regulates vacuum to components based on coolant temperature (engine warm up). It could be used for a few things. If the vacuum lines are all hooked up and everything is working fine I wouldn't remove it. If you do have to keep your EGR you need to keep atleast one of the TVS's with two ports, one in, one out. My a.i.r. pump vacuum line was not (and is not) routed through a TVS. My TVS is only used for the egr (i believe there is a line to the canister also). I used to have a TVS with more ports. One went to the heat riser. The heat riser is located on the bottom of passenger side exhuast manifold. It help the engine to warm up faster.
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