[Diy_efi] gm vortec efi

[Tom Visel]

The 3800 manifolds die where the exhaust gases pass through for the EGR 
valve.  The aftermarket replacements and the newer OEM stuff have a 
metal tube installed to combat the problem. 

Regarding suitability of SBC vortec manifolds for making power, IDK.  
There's got to be a truck forum out there with guys who could tell you.

I do know that the Vortec poppet-nozzle style injectors are infamous for 
being sensitive to deposits.  Apparently (so I'm told,) they were tested 
with Chevron gasoline with Techron.  Since we in the real world aren't 
going to pay that much on a regular basis for our fuel, people come into 
my shop all of the time (~every 2 months or so) with clogged injectors.  
The cure is an injector cleaner that is full of the active ingredient in 
Techron.

TomV

Jim Butterfield wrote:

> them plasitic manifolds on the 3800s have been known to leak... but 
> seems the aftermarket units are better... why not sure..
>  
> jim
>
> */jb <jonnbell at gmail.com>/* wrote:
>
>     i was wondering if anyone has messed with the plastic intake port
>     efi from c1999 gm vortec engines.  i have a sbc with vortec heads
>     and realized that i have the intake, harness, and ecm from a 99
>     delivery box van.  do you suppose that would be worth replacing
>     the holley 750/performer rpm setup ive got?  efi is what i want,
>     but i was told by someone i dont necessarily trust that these
>     plastic intakes arent worth much.  what do you guys think?
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