can anyone tell me what these parts are and what they do?
 

pic #1
pic #2
pic #3

Re: can anyone tell me what these parts are and what they do?
 

Top one looks like a smog piece and the last a cruise control diaphragm.

Re: can anyone tell me what these parts are and what they do?
 

I don't know for sure, except #3 is your cruise control servo.
#1 is a PVS (Ported or thermal vacuum switch) in the middle with two nipples which should have vacuum lines attached (I think). The other two are obviously some sort of thermal switches also, but i have not seen them before.
#2 looks like it might be an older version of a cruise control servo, but I thought those were mounted on the driver's side fender.
I am sure someone with more knowledge than I will post here.

Re: can anyone tell me what these parts are and what they do?
 

Thanks man ya its on a 86 350 with quadrajet if that helps anyone

Re: can anyone tell me what these parts are and what they do?
 

if you had a tbi engine the two sensors in picture #1 the one below your thermostate is a temp coolent switch and the other is a temp sensor
that in picture #2 I cant remember but I'll look it up