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Topic Review (Newest First)
05-02-2012 06:40 AM
DoubleVision This thread started out in 2004, then again in 2009, and now again in 2012. You brought back a old thread to tell us that?
02-05-2009 07:19 PM
machine shop tom ZOMBIE THREAD !!!!!!

RUN AWAYYYYYYYYY!!!!!!!!!




tom
02-05-2009 05:40 PM
va4cqd the vortec name has been around since the mid 80s

also, this thread has been dead for over 4 years
02-05-2009 12:24 PM
oldbogie
Quote:
Originally Posted by IWANTMOREHP
What would I have to change over if I wanted to change my 93' Chevy Silverado 350 5.7L TBI to a 95 5.7L Vortec?
1995 is not a Vortec, L31 commenced with the 96 model.

You need to be a bit more definifive with what the 95 is, a Vortec would not have TBI it has a thing called Central Sequential Fuel Injection. Aside from the words Fuel Injection, it shares nothing in common with TBI.

That said, TBI can be adapted to a Vortec headed engine by using a GMPP or Edlebrock intake that bolts to Vortecs at one and and TBI at the other.

The other simple swap is to use the Swirl Port heads off earlier engines and the TBI bolted to a Vortec bottom end.

Some confusion comes in 95 5.7 liter engines as late production started using the 880 Vortec 4 inch bore block. But these used Swirl Port heads and TBI, the only thing Vortec about these engines is the roller cam block. One also needs to be wary of 305s which were called Vortecs for quite some time before 1996, but never had L31 style Vortec heads on them, just the name is all.

To put a true L31 into a TBI vehicle and use the CSFI of the Vortec will change the fuel system starting with the in-tank pump, fuel lines, computer, and wire harness. A lot is involved with this swap.

Bogie
02-05-2009 02:32 AM
DoubleVision Are you certain you have a Vortec engine? The name Vortec has been used since the 80`s. In 96 GM started using Blocks on the truck line with roller cams, windage trays and the better Vortec heads. Since you say your engine is a 95 then it could be the same engine you have now which is a flat tappet cam, no windage tray and the horrible swirl vane heads. The better Vortec heads have 8 intake bolts in a straight up pattern. The swirl vane heads use the classic 12 bolt pattern. I may have just said all this for nothing but I just wanted to make sure you knew what you had before you jumped in as I`ve seen many be confused by the name Vortec just as well as I`ve seen guys trying to sell "Vortec" heads that are swirl vane heads just because of the name.
02-04-2009 08:42 PM
1989 k1500 vortec
350 TBI to 350 TBI VORTEC SWAP

i have done this to my pickup and the intake is all you need
07-25-2004 07:25 PM
edge You will need a Vortec TBI intake and a driver's side exhaust manifold for Vortec engines along with the EGR tube. You will probably need to install a different chip as well.

Pace Performance and Scoggin-Dickey could both sell you what you need for the swap. Also, check out CFM Technologies for they specialize in TBI performance.

If you have the cash, you should also consider Edelbrock's Multi-Point Fuel Injection Conversion Kit . I just put one on my 94' Suburban with the stock 5.7 engine, but the Vortec conversion is advertised to produce 265 HP and 340 ft/lbs. It comes with everything except the in-tank fuel pump and exhaust manifold or EGR tube kit. You can buy their pump or a pump for a 91' Firebird GTA at a local parts store. It is an easy swap and works and performs as advertised, at least for the stock engine.

Good Luck! Ed. www.edgesz28.com
07-25-2004 03:19 PM
IWANTMOREHP
350 TBI to 350 TBI VORTEC SWAP

What would I have to change over if I wanted to change my 93' Chevy Silverado 350 5.7L TBI to a 95 5.7L Vortec?

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