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Old 07-03-2015, 11:11 AM   #1
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What goes here

My truck is very original and I am wondering if anyone know what hoses went on and where they went to from the white plastic piece in the pic.
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Old 07-03-2015, 12:09 PM   #2
SS Tim
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Re: What goes here

Its the small block vacuum advance solenoid, part of the transmission controlled spark system emission control. Look it up in the FSM section 6T-7 for full details of operation.

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Last edited by SS Tim; 07-03-2015 at 12:15 PM.
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Old 07-03-2015, 12:37 PM   #3
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Re: What goes here

Yep...as Tim said.
Basically it is a type of (period typical) pollution control device rooted in subduing performance to some degree.
I think the way it works is that it intercepts your vacuum advance signal and only allows it to get to the distributor when you are in high gear or thereabouts...thus inhibiting distributor advance at lower rpms, etc.
I'm pretty sure most guys disconnect it for performance reasons. I too still have mine mounted but inoperative.

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Old 07-03-2015, 02:50 PM   #4
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Re: What goes here

Sounds like something I don't have to concern myself with for the moment. I guess when I install my Pertronix Distributor in the truck that piece will become obsolete anyway.
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4
1999 White Tahoe LS 4x2 with Z56 Police Package
1992 K1500 GMC Suburban

Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601

" Circumsatances Do Not Change Responsibility "

" The Sky is not the Limit, Your Mind is." Marilyn Monroe ..


RIP Charlie Watts 1941 - 2021
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