Stock Thermostat Housing Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

78SilveradoSWB · 08-09-2003, 09:06 PM

On my 78 454, the stock thermostat housing has a port opening thats plugged now and the neck where the hose connects from the radiator. This is suppose to be a vacuum port, but for what application?

*mike reeh* · 08-09-2003, 09:25 PM

a temp sensitive vacuum tree.. on my 77 there are 3 ports.. one goes to the distributor advance, one goes to the carb, and the other one either goes to the carb or to the smog pump plumbing.. cant remember since I dont have the smog pump on there anymore..

mike

crackajacka · 08-09-2003, 10:56 PM

yea mine broke so we really need this on there?

*mike reeh* · 08-10-2003, 12:30 AM

the epa says you need it. I say you dont

mike

**old Rusty C10** · 08-10-2003, 09:42 AM

pollution contorl smoluttion controls lol anything that robs horsepower cant be good screw trhem treehuggers anyway LOL

08-09-2003, 09:06 PM	#1
78SilveradoSWB Senior Member Join Date: Apr 2002 Location: Beaverton, OR Posts: 1,615	Stock Thermostat Housing Question On my 78 454, the stock thermostat housing has a port opening thats plugged now and the neck where the hose connects from the radiator. This is suppose to be a vacuum port, but for what application? __________________ Mitch 1978 Chevrolet Silverado C 10 454 BB, TH400

08-09-2003, 10:56 PM	#3
crackajacka Stylin Join Date: Sep 2001 Location: Tuttle, OK Posts: 620	yea mine broke so we really need this on there? __________________ Ive been traveling for some time, with my fishin pole and my bottle of shyne. Most Girls like finished products and just dont understand what a good addiction does for you http://www.paulwall.us/

08-10-2003, 09:42 AM	#5
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	pollution contorl smoluttion controls lol anything that robs horsepower cant be good screw trhem treehuggers anyway LOL __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

08-09-2003, 09:25 PM	#2
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	a temp sensitive vacuum tree.. on my 77 there are 3 ports.. one goes to the distributor advance, one goes to the carb, and the other one either goes to the carb or to the smog pump plumbing.. cant remember since I dont have the smog pump on there anymore.. mike

08-10-2003, 12:30 AM	#4
mike reeh 5 day ban, learn to behave. Join Date: Nov 2002 Location: san diego, ca Posts: 683	the epa says you need it. I say you dont mike



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