Exhaust manifold; vent check valve - The 1947 - Present Chevrolet & GMC Truck Message Board Network

David623 · 12-12-2014, 09:21 AM

I have put a 1999 5.3 Silverado engine and trany into a 1972 Jimmie. From what I see the existing exhaust manifolds will not work without modifying the frame, from research on this website Trailblazer, Corvette, Camaro manifolds will work which is the best choice? Also I am dealing with relocating the A/C compressor, Kwik performance I think has that problem solved, sent them an email for more information. And finally I have put an Aeromotive fuel pump in the new gas tank I need to find a check valve to complete the fuel line.
I will post some pic soon, just put the rebuilt tub back on the frame.

cableguy0 · 12-12-2014, 08:52 PM

im going to move this to the Ls swap section to hopefully get you some answers.

**truckdude239** · 12-12-2014, 09:56 PM

I used trailblazer ss manifolds they cleared good fuel pump should have built i. Check vavle

BR3W CITY · 12-15-2014, 03:28 PM

What do yo need a check valve for? Are you wanting something like a rollover valve? The pump itself "holds" as much pressure as needed, you don't need a 1-way valve on the fuel system.

David623 · 12-15-2014, 07:11 PM

The check valve is for the fuel system, I installed an Aeromotive fuel pump in the new gas tank and there is a supply, return and a vent connection on the pump And I assume it is to prevent a vacuum and not let the gases from the tank to get out.

David623 · 12-15-2014, 07:37 PM

Here is a shot of the new tank and fuel pump installed.

KEWLKATDADY · 12-16-2014, 10:45 AM

Quote:

Originally Posted by David623

Here is a shot of the new tank and fuel pump installed.

Is that a suburban tank?

David623 · 12-16-2014, 10:53 AM

I pretty sure the tank is the same for the Suburban and Jimmy, I got mine from LMC and they list is for both. I do have to modify the tank spout a little it wasn't same as the old tank.

BR3W CITY · 12-16-2014, 02:07 AM

OH you mean on the evap line? My bad, I thought you wanted a check valve in-line with the actual feed or something.

In that case, I've seen a few different things used. You can get away with nothing, but a breather or a PCV (ball-check) will work as a low buck solution.

scottybaccus · 12-16-2014, 03:42 AM

I just left the evap canister connected to the tank.

I used the Hooker cast iron manifolds. They support 500 HP, and fit way better than any stock manifolds I've tried.

12-12-2014, 09:21 AM	#1
David623 Registered User Join Date: Oct 2012 Location: Plymouth In. Posts: 100	Exhaust manifold; vent check valve I have put a 1999 5.3 Silverado engine and trany into a 1972 Jimmie. From what I see the existing exhaust manifolds will not work without modifying the frame, from research on this website Trailblazer, Corvette, Camaro manifolds will work which is the best choice? Also I am dealing with relocating the A/C compressor, Kwik performance I think has that problem solved, sent them an email for more information. And finally I have put an Aeromotive fuel pump in the new gas tank I need to find a check valve to complete the fuel line. I will post some pic soon, just put the rebuilt tub back on the frame.

12-12-2014, 08:52 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: Exhaust manifold; vent check valve im going to move this to the Ls swap section to hopefully get you some answers. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

12-12-2014, 09:56 PM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Exhaust manifold; vent check valve I used trailblazer ss manifolds they cleared good fuel pump should have built i. Check vavle __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-15-2014, 03:28 PM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Exhaust manifold; vent check valve What do yo need a check valve for? Are you wanting something like a rollover valve? The pump itself "holds" as much pressure as needed, you don't need a 1-way valve on the fuel system. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

12-15-2014, 07:11 PM	#5
David623 Registered User Join Date: Oct 2012 Location: Plymouth In. Posts: 100	Re: Exhaust manifold; vent check valve The check valve is for the fuel system, I installed an Aeromotive fuel pump in the new gas tank and there is a supply, return and a vent connection on the pump And I assume it is to prevent a vacuum and not let the gases from the tank to get out.

12-15-2014, 07:37 PM	#6
David623 Registered User Join Date: Oct 2012 Location: Plymouth In. Posts: 100	Re: Exhaust manifold; vent check valve Here is a shot of the new tank and fuel pump installed. Attached Images

12-16-2014, 10:53 AM	#8
David623 Registered User Join Date: Oct 2012 Location: Plymouth In. Posts: 100	Re: Exhaust manifold; vent check valve I pretty sure the tank is the same for the Suburban and Jimmy, I got mine from LMC and they list is for both. I do have to modify the tank spout a little it wasn't same as the old tank.

12-16-2014, 02:07 AM	#9
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Exhaust manifold; vent check valve OH you mean on the evap line? My bad, I thought you wanted a check valve in-line with the actual feed or something. In that case, I've seen a few different things used. You can get away with nothing, but a breather or a PCV (ball-check) will work as a low buck solution. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

12-16-2014, 03:42 AM	#10
scottybaccus Registered User Join Date: Dec 2014 Location: Hutto Posts: 109	Re: Exhaust manifold; vent check valve I just left the evap canister connected to the tank. I used the Hooker cast iron manifolds. They support 500 HP, and fit way better than any stock manifolds I've tried. __________________ Scotty Baccus

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