The idea to put an LS1 in a Fiero isn't new, Alan Swanson (ls1swap) was probably the first to pull it off back in 2002. Archie tried for three years to do one but didn't figure it out until 2004. From my memory of the development, the main problems with doing one in a Fiero are:
1 - Bellhousing is not the same as small block, so standard V8 adapter plate will not work
2 - Flywheel adaptation is difficult, needs more teeth than standard V8
3 - Outboard axle interference with teeth on enlarged flywheel
4 - Stock mechanical water pump in Fiero engine bay makes for a complicated fit. Needs an electric or substantial engine compartment mods. Electric will allow stock-length axles.
5 - Starter block is a complicated fit
6 - Electronic throttle in C5 version isn't compatible with Fiero throttle linkage, need F-body throttle body
The engine is so small it looks undersized for the FIero engine compartment, kinda sunk too far down into the bay. But it definitely gets up and goes, and upgrades are unlimited. It's a challenging install in a Fiero though. Architecturally, it's a 347 cu.in. all-alloy engine with a thermoplastic intake manifold, coil-on-plug ignition, cast aluminum pistons, and nodular cast iron crank with 6-bolt main bearing caps. It weighs 66lbs less than the iron block/aluminum head LT4 and puts out 345-350hp. LS6 is 385-405 depending on year.
I have owned two LS1 Corvettes and I can tell you that anyone who doesn't like the LS1 doesn't know anything about it. It is the greatest pushrod V8 ever made and one of the most magnificent and amazing engines of all time. No, I'm not exaggerating.
If you want to read a thorough explanation of what makes it so great, point your mouse here:
http://www.idavette.net/hib/ls1c.html------------------
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