'67 5.3L Build Thread

[67C10BUB]

Originally Posted by mrhino

mine sound just like that, it would be perfect but it just needs the volume toned down a little. Do you have mufflers pick out?

I have always liked Magnaflow. I will probably go with the quietest ones I can get. This is going to be my daily driver, so I don't want it to give me a headache.

[eagleuh1]

Give it some run time first so the computer can do fine tuning. That will sometimes settle the idle down and smooth it out.

[67C10BUB]

Originally Posted by eagleuh1

Give it some run time first so the computer can do fine tuning. That will sometimes settle the idle down and smooth it out.

That is something I hadn't considered. Is that normal to have rough idle at first? I did notice that some of my header tubes are hotter than others after its been running. This is another reason why I suspected the injectors had an issue. That, and the motor has been sitting for about a year.

[smokinstang70]

keep us informed on how you clean the injectors... where can you have it done... how much? My LS1 has been sitting for about a year as well... just trying to plan ahead when i get it installed.

Great Build... love seeing the progress.

[tonypaul]

Congrats on your build and your start up. I just started my Vortec 454 up for the first time today. Fired right up! I only ran it for about 2 minutes Im still waiting on my oil cooler. I just put a piece of hose with some clamps between the lines just to loop it together... But I know how you feel! I was great feeling after all this work. Anyway- I was wondering how many ports does your power steering pump have? Mine has three and 1 is the main pressure line and one is return and one is vent, but I cant tell which one is vent and which one is return. If yours has three- which one is which and what did you do with the vent line?
Thanks

[67C10BUB]

Originally Posted by tonypaul

Congrats on your build and your start up. I just started my Vortec 454 up for the first time today. Fired right up! I only ran it for about 2 minutes Im still waiting on my oil cooler. I just put a piece of hose with some clamps between the lines just to loop it together... But I know how you feel! I was great feeling after all this work. Anyway- I was wondering how many ports does your power steering pump have? Mine has three and 1 is the main pressure line and one is return and one is vent, but I cant tell which one is vent and which one is return. If yours has three- which one is which and what did you do with the vent line?
Thanks

Mine only has 2 ports, pressure and return. Sorry I can't help, must be a different pump. It is so nice to see that there are so many people out there as crazy as me, to jump into an old truck, build it from the ground up, and even swap in a more current motor and trans. My friends say that it is a big waste of time, but you just can't get the style of the old trucks any more.

[68GMCCustom]

I think some pumps are setup with extra ports for hydroboost? Mine looks like it has to high and 2 low pressure fittings.

[tonypaul]

Originally Posted by 68GMCCustom

I think some pumps are setup with extra ports for hydroboost? Mine looks like it has to high and 2 low pressure fittings.

How did you run the lines? The pressure is a no brainer but Im kinda stumped on what to with the other two. Maybe Tee them together?

[68GMCCustom]

I haven't plumbed mine yet....still pondering. May buy an earlier pump to simplify things before its all over. .

high pressure is all oyu'd need to worry about. the low pressure ones are returns anyway...so capping one shouldnt be a prob.

[67C10BUB]

I sent my fuel injectors to Engine Performance Injectors in Whittier, CA. It was $190 OTD and they are somewhat local to me so I saved on shipping. Their phone number is (562) 693-8236 on web is fuelinjectors.com. The guy seemed pretty knowledgable. I'll post again when I get them back to see if it helped my irregular idle. The injector guy seemed pretty sure that it would help.

[sp690]

Great build and great info, im planning on doing an ls swap and you have answered alot of questions that i alredy had in mind, keep up the good work.

[Rokcrln]

On your fan shroud you will want to fill the gap caused by adding the 1/2" spacers or you WILL have heating problems in the summer if you are stuck in traffic. The air will pull through the gap much easier than through the 4 core radiator causing an over heating condition. You should be able to find some push on weather stripping that will simply push on to the shroud edge and fill the gap. As for you rough idle problem if cleaning the injectors does not work I think run time will be the main issue you will find. All of these EFI motors need several start cycles and run time to self tune. As for the hot and cold header tubes is it possible that may have something to do with this being a D.O.D. motor? Looking forward to getting started on my 2005 5.3L swap for LowBuck here soon. I have the motor and 4L60 sitting on the shop floor with 20K on the ticker as well as the harness and computer from Street and Performance ready to go. I am going to order the ECE mounts from Stan today or Monday then I just need the time. And for those who asked yes stock Camaro manifolds will fit really well in the truck frame. I will go to headers some day but I am un-decided if I want to go with a Turbo set up or charger so until I figure that out I will run the manifolds.

Kevin
LFD Inc.

[mrhino]

Let us know how those injectors work out. keep up the good work.

[Rokcrln]

I may have missed it but did they wire in the cruise control for you as well? I had Street and performance add the wires for mine but have yet to read about the hook up. The Drive by Wire's make it very easy.

Kevin
LFD Inc.

[dan76]

Nice work......subscribed.

[67C10BUB]

Originally Posted by Rokcrln

On your fan shroud you will want to fill the gap caused by adding the 1/2" spacers or you WILL have heating problems in the summer if you are stuck in traffic. The air will pull through the gap much easier than through the 4 core radiator causing an over heating condition. You should be able to find some push on weather stripping that will simply push on to the shroud edge and fill the gap. As for you rough idle problem if cleaning the injectors does not work I think run time will be the main issue you will find. All of these EFI motors need several start cycles and run time to self tune. As for the hot and cold header tubes is it possible that may have something to do with this being a D.O.D. motor? Looking forward to getting started on my 2005 5.3L swap for LowBuck here soon. I have the motor and 4L60 sitting on the shop floor with 20K on the ticker as well as the harness and computer from Street and Performance ready to go. I am going to order the ECE mounts from Stan today or Monday then I just need the time. And for those who asked yes stock Camaro manifolds will fit really well in the truck frame. I will go to headers some day but I am un-decided if I want to go with a Turbo set up or charger so until I figure that out I will run the manifolds.

Kevin
LFD Inc.

Thanks for the input. It is always good to hear someone else perspective. It is hard to think of everything when you are so focused on other parts of the build.

[67C10BUB]

Originally Posted by Rokcrln

I may have missed it but did they wire in the cruise control for you as well? I had Street and performance add the wires for mine but have yet to read about the hook up. The Drive by Wire's make it very easy.

Kevin
LFD Inc.

Mike at Speartech said that with the 2008 motor the cruise control runs through the body control computer. He said that it is not an easy add on. If you have other info please let me know. I would love to have it.

[Rokcrln]

Originally Posted by 67C10BUB

Mike at Speartech said that with the 2008 motor the cruise control runs through the body control computer. He said that it is not an easy add on. If you have other info please let me know. I would love to have it.

On my 05 it was a simple add of 3 wires because the computer had all the functions already in their. It was a free add so it must have been that simple. It is hard to believe that a function like C.C. that controls your drive by wire throttle would not be in the engine computer on the 08 when it is on the 05's? But that is why I paid for a harness, I only know enough to get my self in trouble

Kevin
LFD Inc.

[67C10BUB]

Originally Posted by Rokcrln

On my 05 it was a simple add of 3 wires because the computer had all the functions already in their. It was a free add so it must have been that simple. It is hard to believe that a function like C.C. that controls your drive by wire throttle would not be in the engine computer on the 08 when it is on the 05's? But that is why I paid for a harness, I only know enough to get my self in trouble

Kevin
LFD Inc.

Same with me. I only know what Mike told me.

[eagleuh1]

Get yourself a subsciption for AlldataDIY.com for your 2008 engine and donor vehicle. Download all the prints for the computer and engine controls. That way you can look and see for yourself. On the 2005, it was simply running a 12v supply to a switch. Turn it on, actuates the CC. tap off 12v to a momentary on switch for the set CC and another temporary on switch for the accelerate. You also have to add the 2 pole brake switch for cutting off CC when brakes are touched. Then attach the switches to the wires labeled for those functions on your PCM harness. 2008 though have no idea. Good luck. Just having all those wiring diagrams helps to solve problems that sometimes pop up also. Again good luck with the CC, it's nice having it in these old trucks on long trips.

[eagleuh1]

Very cheap but effective Cruise Control switch. One on off switch, 2 momentary on switches from radio shack, some sheet metal and wire.

[68GMCCustom]

what is that thing next to it? trailer brake or something? I see the OBDII access port under the ignition.

[eagleuh1]

Yeh, trailer brake controller. I tow a travel trailer all over the country with it.

[Rokcrln]

Originally Posted by eagleuh1

Yeh, trailer brake controller. I tow a travel trailer all over the country with it.

So what did you do about the speedo in yours? I am looking at swapping over to a new set of gauges for mine and re-wire the truck as well. I hate having wire gremlins and the wiring is the one step I skimped on when I built low buck.

Kevin
LFD Inc.

[eagleuh1]

I just catch up to everyone else on the freeway and then set my cruise control. And hope eveyone else isn't speeding. I didn't get around to it yet, but i'm probably just going to use one of those Abbot X-box converters that Shon sells for. He's using one and says it works good. Yours "done" yet.