Vortec Swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dchamber · 09-07-2009, 10:29 PM

I am going to swap my Vortec 5.7 out of my 2000 into my 69. Has anyone else done this and if so how well did you get the wire harness tucked up to make it clean? What about the A/C components? Also I am going to swap out the auto 4l80 it has with a manual. Will I have any problems with the ecm not seeing the trans? If so what is the fix?

I am interested in seeing some pictures of this swap too. Thanks

bac1755 · 09-07-2009, 10:37 PM

I put a vortec motor in my 71 but I didnt end up using the fuel injection. I get 18-20 MPG with a carb and a buddy of mine gets 13-15 with his fuel injected vortec.

Dchamber · 09-07-2009, 10:42 PM

Thats good to know. I will look into that option too.

'72customdeluxe · 09-07-2009, 11:26 PM

Still have to run an electric fuel pump though as there are no provisions for a mechanical pump.

bac1755 · 09-08-2009, 11:34 AM

Quote:

Originally Posted by '72customdeluxe

Still have to run an electric fuel pump though as there are no provisions for a mechanical pump.

True, But it beats the hell out of running fuel injection.

SWEET7T · 09-08-2009, 04:04 PM

The computer will throw the check engine light if it isn't hooked to the trans. No biggie, as it will still run the truck. If I were going to have OBD2 in mine, I would dedicate a CEL, but then yours will always be lit. The thing to do would be to have the computer flashed to a manual trans ECM, or junkyard one.

Dchamber · 09-08-2009, 04:12 PM

I will be installing a light somewhere in the dash. Is there anywhere else I can send the ecm to get flashed other then the dealer?

Dchamber · 09-08-2009, 06:59 PM

Quote:

Originally Posted by bac1755

I put a vortec motor in my 71 but I didnt end up using the fuel injection. I get 18-20 MPG with a carb and a buddy of mine gets 13-15 with his fuel injected vortec.

What about power? Does it still get the same hp and torque?

68fixeruper · 09-08-2009, 07:26 PM

you can send the ecm to www.speartech.com

bac1755 · 09-08-2009, 08:56 PM

Quote:

Originally Posted by Dchamber

What about power? Does it still get the same hp and torque?

If tunned the right way it will run very strong.

My set up is:
1998 vortec block .040 over, vortec heads with screw in studs, comp cams valve springs, comp 1.5 roller rockers, edelbrock air gap vortec intake, comp cam Xtreme Energy XR676HR roller cam, Holley 750cfm 4-bbl Carburetor, holley blue fuel pump, and accel ignition.

I had a 700R4 trans behind it at first and thats when it was getting the best MPG's. When I put a TH350 behind it MPG's dropped but not bad since the motor was built to run.

SWEET7T · 09-09-2009, 10:05 AM

Quote:

Originally Posted by Dchamber

I will be installing a light somewhere in the dash. Is there anywhere else I can send the ecm to get flashed other then the dealer?

Westers is the first that comes to mind.
Wester's

A buddy of mine just had his ecm tuned for a FI 383 he just finished for his '97. I will try to get ahold of him to see who he had do his...

09-07-2009, 10:29 PM	#1
Dchamber Registered User Join Date: Jul 2009 Location: Safford AZ Posts: 34	Vortec Swap I am going to swap my Vortec 5.7 out of my 2000 into my 69. Has anyone else done this and if so how well did you get the wire harness tucked up to make it clean? What about the A/C components? Also I am going to swap out the auto 4l80 it has with a manual. Will I have any problems with the ecm not seeing the trans? If so what is the fix? I am interested in seeing some pictures of this swap too. Thanks __________________ 1967 Chevy c20 1969 Chevy K20 1972 Chevy K5, LS Swap 1972 Chevy C10 1985 Jeep Cherokee SBC, sm465, np205 with 1 tons 2012 Jeep JK Last edited by Dchamber; 09-07-2009 at 10:30 PM.

09-07-2009, 10:37 PM	#2
bac1755 Registered User Join Date: Jan 2009 Location: Denison, Texas Posts: 245	Re: Vortec Swap I put a vortec motor in my 71 but I didnt end up using the fuel injection. I get 18-20 MPG with a carb and a buddy of mine gets 13-15 with his fuel injected vortec. __________________ 1971 GMC 1972 Small Blocked DATSUN 240Z Dads old car

09-07-2009, 10:42 PM	#3
Dchamber Registered User Join Date: Jul 2009 Location: Safford AZ Posts: 34	Re: Vortec Swap Thats good to know. I will look into that option too. __________________ 1967 Chevy c20 1969 Chevy K20 1972 Chevy K5, LS Swap 1972 Chevy C10 1985 Jeep Cherokee SBC, sm465, np205 with 1 tons 2012 Jeep JK

09-07-2009, 11:26 PM	#4
'72customdeluxe Registered User Join Date: Jan 2008 Location: Tejas Posts: 691	Re: Vortec Swap Still have to run an electric fuel pump though as there are no provisions for a mechanical pump. __________________ '72 cheyenne super step, '05 long bed gmc

09-08-2009, 04:04 PM	#6
SWEET7T Try spinnin 4 rear tars Join Date: Sep 2003 Location: Salt Lake City, Utah Posts: 757	Re: Vortec Swap The computer will throw the check engine light if it isn't hooked to the trans. No biggie, as it will still run the truck. If I were going to have OBD2 in mine, I would dedicate a CEL, but then yours will always be lit. The thing to do would be to have the computer flashed to a manual trans ECM, or junkyard one. __________________ SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB

09-08-2009, 04:12 PM	#7
Dchamber Registered User Join Date: Jul 2009 Location: Safford AZ Posts: 34	Re: Vortec Swap I will be installing a light somewhere in the dash. Is there anywhere else I can send the ecm to get flashed other then the dealer? __________________ 1967 Chevy c20 1969 Chevy K20 1972 Chevy K5, LS Swap 1972 Chevy C10 1985 Jeep Cherokee SBC, sm465, np205 with 1 tons 2012 Jeep JK

09-08-2009, 07:26 PM	#9
68fixeruper Registered User Join Date: Apr 2006 Location: Amarillo, Tx Posts: 267	Re: Vortec Swap you can send the ecm to www.speartech.com

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