heat riser valve question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 03-12-2008, 06:57 AM

i still have the heat riser valve on my truck, but its not connected and i dont know what position its supposed to be in to be open. i know that theres supposed to be a diaphram that either sucks it open or closed. what do yalll think?

**jerry moss** · 03-12-2008, 07:02 AM

if your truck is a 67-72 it shouldn't have the vacuum controled valve unless someone stuck a later motor in it.

crm318 · 03-12-2008, 07:22 AM

its a 78 van

**jerry moss** · 03-12-2008, 08:17 AM

just drop the pipe down enough to see the butterfly and tie it up in the open position if you are missing the rest of the hardware. here in california it will not pass smog inspection if parts are missing but not sure on the laws where you are.

03-12-2008, 06:57 AM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	heat riser valve question i still have the heat riser valve on my truck, but its not connected and i dont know what position its supposed to be in to be open. i know that theres supposed to be a diaphram that either sucks it open or closed. what do yalll think? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

03-12-2008, 07:02 AM	#2
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,936	Re: heat riser valve question if your truck is a 67-72 it shouldn't have the vacuum controled valve unless someone stuck a later motor in it. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

03-12-2008, 07:22 AM	#3
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: heat riser valve question its a 78 van __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

03-12-2008, 08:17 AM	#4
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,936	Re: heat riser valve question just drop the pipe down enough to see the butterfly and tie it up in the open position if you are missing the rest of the hardware. here in california it will not pass smog inspection if parts are missing but not sure on the laws where you are. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

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