73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: fred75 on September 17, 2010, 11:21:08 pm
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Any body have/ know the specs on these??? When trollin I see these black ones and red ones. Wondering if there both the same? I need a switch that opens a vacuum port at operating temp. I also wonder if any of these will close or open a port at operating or a different temp?
3053331 is stamped on top. The ports are labled from top to bottom; M HV 2 1
Came off a '84 350 in a C-10
(http://i250.photobucket.com/albums/gg243/g4lskeene/VacuumSwitch.jpg)
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Ported Vacuum Switch L ENG CODE,EFE - 4 PORT - BLACK - 110 DEG FULL OPER TEMP - OE #3053331
1984 : GMC : G1500 VAN RALLY : 5.7L 350 cubic inch V8 4BBL (L) OHV : Electrical-Switch & Relay : Ported Vacuum Switch
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The TVS on my '79 5.7 Big 10 was orange. When i put in my 383, I asked for a new one at the local parts store and got a black one. Works fine for me...don't know if there is any difference.
(http://www.delbridge.net/vacu14.jpg)
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The TVS on my '79 5.7 Big 10 was orange. When i put in my 383, I asked for a new one at the local parts store and got a black one. Works fine for me...don't know if there is any difference.
Hey thanks for the reply. Got a chance to do a little more research and for some reason they are offered in different colors. I think your right, I don't think there is any difference. This truck did not come with any vacuum controls and when I saw these I saw a solution. Looks like I'll have to do some experimenting to figure out what the ports do and when... I have a bunch of emission schematics to look at that might give me a clue.