I am in the final stages of what I hope will not have been a huge
waste of good money. I have an "89" Silverado 3/4 Ton HD with 350 TBI
and 400 Turbo automatic. I put 225K miles on the truck, and needless
to say she was beginning to get a bit tired. Instead of dropping 35K
on a new truck, I decided to give my truck a complete transplant.
Starting with a Stroker 383 w/ 4 bolt mains and rebuilt original style
TBI heads. Throttle body and intake are bored out to 50mm, and with
an adjustable pressure regulator installed in the TB, and a new high
volume fuel pump in the fuel tank, it's supposed to be capable of
flowing 750 CFM. A complete Roller Camshaft, Lifters, and Rocker Arms
assembly. Heddman long tube headers with 3" dual exhaust. A custom
ECM Chip burned by Harris Performance TBI Chips. The software claims
this setup will produce 373HP / 483 LB Torque.
The Turbo 400 (3 speed / no overdrive) was completely rebuilt and
modified by Mad Dog Transmissions to handle the extra horse power.
The current rear gears are 3.73's and I am considering changing them
out for 4.10's. And I am also installing an electronic Detroit Locker
in the rear.
I have about $8,500 invested in this build. I know, I know... that's
a lot of money to sinck into an "89". But for me, if all goes well,
it will have been worth it. That is a big IF though :(