How different are the 4cyl and 6cyl fiero's

[lercs]

well i have a 84 2m4 fiero and i have a lead on a 2.8L with 15XXX km's on it for cheap. How much work is it to change from a 2.5L to the 2.8L

like do i  need to change computers, or drivetrain or anything?

Thanx for your help

Grant

[FieroBUZZ]

Good News....yes you can switch.

Bad news......  It isn't easy.

84 Fieros did not come with a v-6.  The cradle will need some things added to mount the 2.8.  The electrical system was redesigned in 85, moving the main junction from the engine compartment firewall to the side by the battery.  You need to relocate the 84 system to get it away from the heat of the manifold.  ECM and tach (crystal or change to v-6 instrument pack).  Odds and ends.  If you have a v-6 donor the job is better as you should have all the parts.

I think Dan's car went to a 3.1 so he can probably better describe the details.

He'll tell you it's just as easy to add a 3800.  

[FieroDough]

i will have a spare 85GT cradle when I am done the swap. You are welcome to it. won't be until end of may early june tho.

[lercs]

hi,
well i actually have a 1986 as well

so would the parts from that be usable?

also i dnt want to go to a 3800, if i do a comlete swap to a different engine it will be a 350

also does anyone know if the 2.8 blazer engine is the same as the fiero engine

[2ML67]

Most rear wheel drive 2.8's I believe are compatible except the starter bolts on the opposite side which can be fixed by redrilling block on the appropriate side. If it is a cast iron head engine Fiero top end bolts right on, with aluminum heads there are differences.