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#1 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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My Ramp truck isn't AC truck and it cuts the heat off totally in the summer which helps a lot.
SCOTI, I have the valve in my 71 C 10 with the vacuum valve in the other line with the LS 6.0 and not had any problems before. Can you share some links on the problems are symptoms of it. ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. Last edited by Andy4639; 04-06-2021 at 10:52 AM. |
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#2 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,938
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Re: Heater core shut off valve
Quote:
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#3 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,420
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Re: Heater core shut off valve
The first image below from Summit looks very close to the cross-over used with 60's 289 fnords. The other images, also on Summit are from 4 Seasons that have internal valves. 4 seasons has a variety of manual cross-over styles, also shown in Summit.
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'67 GMC 2500, 292, 4spd, AC |
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#4 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,938
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Re: Heater core shut off valve
Quote:
The unit I've seen is a billet piece. Very clean unit. I'll post up the info as soon as I can access it but it's basically just a higher-end (and more expensive) version of the early variations in your provided link/s.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#5 |
Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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Re: Heater core shut off valve
I screwed a stainless steel body, teflon seat ball valve into the intake manifold, and run the hose from it, with an elbow.
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1968 SWB Step Side, Big Block, 4L80E , Running! |
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#6 |
Senior Member
![]() Join Date: Dec 1999
Location: Southern California
Posts: 2,753
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Re: Heater core shut off valve
I believe the two types of vacuum operated valves for 67-72 trucks are different. If I recall correctly the early one without bracket is normally closed and later one with bracket is normally open. Both could be used together to create a bypass.
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Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
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#7 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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I had a hard time getting mine to burb when I installed it. I finally had the front end jacked up and took the 2 small steam ports loose on the front of the engine. That seemed to do it. Haven't had any more issues since. That was back in 2014. That I know of any way the truck runs cool even with the AC on.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#8 |
Registered User
Join Date: Jun 2016
Location: Richland Or.
Posts: 110
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Re: Heater core shut off valve
My 70 K10 is non a/c so I installed valve like Grumpy showed pic of. There is a vacuum operated valve for a/c trucks, but cant find a valve for mine, they dont make one? Or does heat lever control something other than a valve? thanks!
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#9 |
Senior Member
![]() Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,254
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Re: Heater core shut off valve
Heat lever only controls a blend door on non-a/c trucks.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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#10 |
Senior Member
![]() Join Date: Jun 2022
Location: San Ramon,CA
Posts: 455
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Re: Heater core shut off valve
If I paint my vise-grips silver, does that count as billet?
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#11 |
Registered User
Join Date: Jun 2016
Location: Richland Or.
Posts: 110
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Re: Heater core shut off valve
Thanks, I wont pull box off firewall just to see whats there. The other problem is keeping fan switch adjusted, will get it right, but in a few hundred miles it gets finicky again, blue loctite on screws? Thanks again for reply!
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#12 |
Registered User
Join Date: Jun 2016
Location: Richland Or.
Posts: 110
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Re: Heater core shut off valve
Anytime you can replace a gate valve with a ball, good idea.
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