is the multi-port system only a 6 cylinder system.  did gm ever put it on v8's  

It depends on the terminology I guess...

Multi-point inject can simply mean a fuel injector per cylinder (usually at the manifold face and directed at the intake valve). If that's the case, there were many different types used on GM vehicles. Probably most notably the cross-ram TPI systems...

A way to further classify injection systems would probably be how they operate each injector, such as: batch-fire, sequential, or a constant fuel flow setup.  

i found the mag that reefers to this it is the january 2008 issue of chp.  there is a article about lt1 camaros that starts on page 44, on page46 there is a side bar telling what mods the 5 available years offered and the differances between them. the 1993 version has multiport fuel injection as one of the differances along with a speed-density air metering among other things.  the fuel injection changed in the 1994 year going to a sequential port efi and switched from speed density to maf.

so now maybe i can state my question in a more understandable way.

obviously it came with a v8 because i came wiht the lt1 package.  

so can someone tellme what the differance is between these two fuel injections?

thanks.  

You didn't really make your question any more clear...

Sequential injection, MAF, speed density, etcetera are all types of multi-point injection.

The difference between the sequential-fire injection used in the LT1 and say for example the older TPI systems used on the Gen I engines is how the injectors are fired. A camshaft positioning sensor is used as with SFI systems as input to determine when the injector should be fired as to provide the cylinder with fuel only when it needs it, the TPI systems were batch fire systems so each bank fired at a time which put a lot more fuel floating around. The SFI systems are an an attempt to improve efficiency.