My 1985 gt recently started knocking so i'm looking to replace the motor its a 4 speed manual I was thinking maybe a 3.1 from a early 90s cavi would work? any other cars that could be a direct bolt in cause I really don't want to have to do any mods I just want to go to the yard and pull a motor and drop it right in

I would say the 3.4L from a camaro/firebird is the closest you will get. You will need to drill starter mounting holes (or have a shop do it). Otherwise, it is pretty much drop in (timing cover/pan have to be changed, along with intake pieces).

The 2.8L in the fiero was a high output engine, so not just any 2.8 will work and some 3.1 will not have the correct ignition system. I think a 3.1 from the old Pontiac Transport will bolt up (but those will be rare).

You may want to search this forum for "3.4 install"

You want the 3.4 from a 93-95 Camaro/firebird.

The only 100% direct bolt-in is a 2.8 from another 85-86 Fiero.

Anything else may require some modification to use.

^^ What he said.

Although, the mods needed for a 3.4 V6 are very minor.

I asked nearly the same question a while back. The consensus seemed to be the best way to go if you need a new engine is the 3800 SC. Seems like too much trouble to me, but their arguments are sound. Anything less seems to be similar money for not much, even a direct replacement. Given the state of the world, another Fiero may be your best bet. Cheers

quote Originally posted by dobey: The only 100% direct bolt-in is a 2.8 from another 85-86 Fiero. Anything else may require some modification to use.

This.
A 3.4 swap isn't too difficult, but you do need to drill new starter mounting holes in the block. There is potential to bugger the block if you don't know what you're doing.
Only another Fiero 2.8 is a 100% direct bolt-in. You can rebuild a Fiero 2.8 using a 3.1 crankshaft for a bit more power but don't do it unless you were planning to rebuild anyway. It's not worth the cost to do it just for the added displacement and power.

quote Originally posted by Formula88: This. A 3.4 swap isn't too difficult, but you do need to drill new starter mounting holes in the block. There is potential to bugger the block if you don't know what you're doing. Only another Fiero 2.8 is a 100% direct bolt-in. You can rebuild a Fiero 2.8 using a 3.1 crankshaft for a bit more power but don't do it unless you were planning to rebuild anyway. It's not worth the cost to do it just for the added displacement and power.

Use Rodney's jig for the new starter holes and it is almost idiot proof (you have to go out of your way to screw it up using the jig) - but if you can read and follow simple directions then all is good.

Alright guys thanks, I was really hoping their was a bolt in but I guess not. Im prob gonna take it to the junk yard.

Part it out here and on eBay, make enough for another Fiero.

quote Originally posted by steiblerm: Alright guys thanks, I was really hoping their was a bolt in but I guess not. Im prob gonna take it to the junk yard.

The 3.4L swap is a simple nearly bolt in job. It uses the identical mounts, and all the other 2.8L bolt on parts, manifolds , distributor, dog bone, accessories etc. . All you need to do is relocate the starter (no big deal), use a few small adapter parts and bolt your trans up, If you have an auto you'll need to order the 88 V6 flexplate and that bolts up too. Its so darn simple a child could do it. Its almost plug and play and Rodney Dickman sells the jig and little parts that you will need for the engine conversion. Upgrading an engine couldn't get any easier. .

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

How about going from a iron duke to a 3.4? How much work and additional parts?