ZZ3 and TBI

[John Zarli]

Shannen Durphey wrote:

> Several times there have been posts to this by people
> attempting to run Chevy's ZZ3 crate motor in a TBI vehicle.
> Has anyone had any success (or failures) doing this?  I'm
> looking for war stories here, victorious or otherwise.
>
> Shannen

I took a 1988 4 bolt 350 truck "core" & installed a ZZ3 cam, hydraulic
roller lifters, crane rocker arms, &  H345P pistons.....all under a TBI
manifold.A zz3/tbi EXCEPT that I used the cast iron truck heads which
have a swirly thingy instead of  nice big valve pockets like performance
heads do. I also ground out just enough of the aluminum tbi manifold to
accommodate the larger 2" bore tbi unit that normally comes with a bb
tbi. I am using a stock chip in a 747 ecu.  I get a nuisance code 32
when the highway test occurs & sometimes the idle hunts a bit, but all
in all no major problems.....I'm sure a custom chip could fix the
aforementioned problems. (ANY VOLUNTEERS???) BTW, this is installed in
an Astrovan in place of the V6 and passed the FL emmission sniff test.
I doubt that it makes 350 HP, (those truck heads),  but it moves 4200 lb
Astrovan  pretty good (VBG) easily revs to 5500+ rpm. 14+mpg daily city
driver.