TBI injection replaces the carb with a throttle body w/ injectors
mounted above the throttle blades. they also have some of the worst
heads GM ever produced in an overzealous attempt at acheiving low end
torque by using runners that are too long and too narrow.
Vortec is a completely different fuel injection system that uses 8
injectors mounted after the throttle body instead of the TBI system's
2 injectors before the TB. the vortec engines also use the LT1 port
design to achieve one of the best heads you can buy for a SB chevy.
a Vortec 5700 has 45 more HP than a TBI 350.
Vortec is a term that GM is using for some intake technology, seems
to be mostly an advertising slogan.
TBI means Throttle Body Injection, which simply means that the gas
is injected into the throttle body, which is a single point injection
system, as opposed to the MPI or Multi Port Injection. MPI has the
injectors just before the intake valves.
Some one asked about EFI, EFI is Electronic Fuel Injection, which
means that the injectors are controlled electronically instead of
mechanically. And almost all cars have electronic controlled injectors.
And one additional item. A carburator is device with a bowl to hold
fuel, connected to a tube leading to the intake of an engine, like a
throttle body. As the air passes through the tube it sucks the gas
out of the bowl.
You were asking questions about fuel injectors, which take the place
of the carburators on engines. So your question was not about carburation,
rather it was about fuel injectors.
"They that can give up essential liberty to obtain a little temporary
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