305 TBI for a 355

[steve]

i recently changed engine sizes in an '89 silverado pu ,before i did i talked to
several
mechanics around town. i either got no info or bad info
here is alist of parts i found out the hard way are different between engines
injectors,o2 sensor,egr valve and eprom
the eprom i got from a gmc dealer, it doesn't understand hi-per cams well at all

even so called computer cams.i called alot of performance chip places, they
wanted
between $400 to $500.so i am going to reprogram it myself. thanks to all the
good
info at this website. good luck   steve


Todorovic wrote:

> Hi.  First to introduce myself, my name is Igor and I own two cars I love.
> A 1981 Olds Delta 88 powered by a 455, th400 and 3.23posi.  The second
> (recent addition) is a '88 WS6 Trans AM with the L03 305 TBI, t-5 trans and
> 3.08 posi.  The TA has a 140,000 mile 305 that makes no power and needs to
> go.  I would like to replace it with a 355 but on a serious budget
> (university tuition and all).  Actually, it really could use a new motor so
> that is a must.  The 305 I have so I can work on it.  355 I can get so that
> is another option and would like this better 'cause for the same stuff I do
> to the motor I could get 40 more HPs or so.  My goal is to make this TA get
> good gas milage and still be able to take a 5.0 Mustang (somewhat modified)
> in the 1/4 mile and top end.  BUT HERE IS MY CONCERN.
>
> Can my 305 TBI work with a 355 with little or no mods.  What would changing
> a PROM do?  If the TBI can't work with the 355, what would be minimal mods
> necessary.  Also, will I need to change the throttle body or the ECM or just
> the chip or nothing.  Right now the motor stops making power at 4000 RPM,
> starts to slow down at 4500 RPM.  I would like it to PULL to 5000 RPM and
> that to be the shift-point.  I think that I would remove the A.I.R pump if
> possible and add some shorty headers to the car.  Also, it has no cat and
> has a Dynomax muffler right now.  Thanks a lot guys.  I have been debating
> what to do because I can't get a concrete answer on the fuel injection
> question.  I know that a Holley throttle body and the Edelbrock intake is
> desirable, BUT, in Canadian funds that means about $1200 with a Jet Chip and
> I can't afford that and the motor.  Even if the 355 dosen't live to its
> absolute most potential with the TBI, that is OK.  As long as I can pull 250
> HP and 325 ft-lbs of torque.  Thanks.  Igor.  Here is my web-site IF anyone
> is interested:
>
> http://members.home.net/igor455/olds.htm