Vortec

[bloodybronco]

Hello,

I have a 73 gmc 350, 3spd manual w/low trany, 3/4ton daily driven truck.
and i am planning on putting in a vortec 5700 in it.

I am currious as to who did it and am just wondering any snaggs or tips that people had/have during the swap. I have a complete working 97 yukon that i'm taking everything out of. also i am not very good with computers and finding stuff on the internet.

1.Tranny hook up: I have been searching for a flywheel for the vortec that will work with my tranny, and found one company( http://www.streetperformance.com/par...96-198861.html ) but if anyone knows of other company's out there. I was also wondering if anyone knows if i could use a flywheel from a new truck that will match with my pressure plate clutch, or any other options such as a new style flywheel with new press. plate, with old style clutch (i don't know how many splines my input shaft is.) Just any ideas in general.

2. Wiring: i am going to try to see if i can make my own harness straight from the yukon, but if i run into problems, what are some good company's that make wiring harnesses (other than painless because they are $1000 and i refuse to pay that much for only wires)

3. fuel set up, i'm still playing with the idea of mounting the yukon tank in my truck, but what are some other options (i have a dual tank truck now, and it would be cool if i could keep both tanks functional)

Thanks for any input that you guys can give me

[gchemist]

Welcome to the site.
www.painlesswiring.com has a harness available.
Try this site too: http://www.americanautowire.com/

You can find fuel pump and other conversion stuff here: http://www.hotrodlane.cc/

Check with http://www.advanceadapters.com/ for flywheel conversions.
Now would be great time to install an NV4500. It's strong, OD and can haul a large load.

You can find a high pressure pump part number on this LS1 conversion.
http://www.hotrodlane.cc/77chevytruck/77chevy.htm

[bloodybronco]

Thanks for the websites, the nv4500 tranny is next on my list, but right now this truck is still my daily driver, so i don't have the time or money for that swap aswell.

[MARKDTN]

You should be able to find a stock flywheel for a manual transmission 1-pc rear seal engine. No big deal. I think the one from a 4.3 will work.

I don't know what fuel pressure a Vortec runs, but I used a stock 87 fuel tank and just changed the pump on the Tuned-Port swap in my '83. You can run 2 tanks but switching is an issue. Another option is to run 1 fuel injected tank and run a transfer pump from the other tank into that one.

Sounds like you have an automatic transmission donor vehicle and are swapping it into a manual trans. If so, you will have to have the PCM re-flashed for a manual trans. You will also want the ODB2 stuff taken out so it is not looking for dual O2 sensors and other stuff. You can use the Yukon harness, but you will have extra wires and will have to do some wiring. This is probably the hardest thing about a fuel injected swap.