2.8l to 5.0l/5.7l
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From: Sharon, CT
2.8l to 5.0l/5.7l
I have the 2.8mpfi engine in my 86 firebird and i want to put a 305 or 350 in it. I have found a 305TPI and I just need to know if i would have to mess with the injectors and fuel lines to make the conversions?? Or could i just bolt it in and go?
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Joined: Jun 2000
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From: Philippi,WV
I 've thought about the same thing! I have a 91 3.1 and MAYBE someday convert it to a V8( I already have a 350 4 bolt).
The Injection is a tricky thing. I know that you will need the fuel hardware thats on the engine(injectors,fuel rails, plenium, etc,)
A wiring harness and computer(V8 of course) along with all the plumbing(exhaust manifolds,hoses,etc)
I'm not sure but you may need a bigger radiator for more cooling. Also, your front springs will need to be changed to handle the added small block weight!
If possibly, hunt up a wrecked car and get the entire thing so that you have everything that you need. I CAN be a pain in the @$$( which is why I haven't started yet).
------------------
91 Firebird v6(not much longer)
83 Toyota Celica GT(not your typical rice car! RWD and no"crappy" decals!
"Too fast to live, too fast to DIE!"
The Injection is a tricky thing. I know that you will need the fuel hardware thats on the engine(injectors,fuel rails, plenium, etc,)
A wiring harness and computer(V8 of course) along with all the plumbing(exhaust manifolds,hoses,etc)
I'm not sure but you may need a bigger radiator for more cooling. Also, your front springs will need to be changed to handle the added small block weight!
If possibly, hunt up a wrecked car and get the entire thing so that you have everything that you need. I CAN be a pain in the @$$( which is why I haven't started yet).
------------------
91 Firebird v6(not much longer)
83 Toyota Celica GT(not your typical rice car! RWD and no"crappy" decals!
"Too fast to live, too fast to DIE!"
Supreme Member
Joined: Mar 2000
Posts: 13,414
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From: Central NJ, USA
Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
I agree with PowerHawk... find a clapped out V8 f-body (the newer the better for the intake area), and rebuild the motor while you drive the 6 around. Then take a week off of work, and a week outta your social life 
and switch everything over. While you're at it, clean up the Firebird's engine bay too...
The only bonus you get is if you buy a v8 with TPI injection, the v6 MPFI motor uses the same in-tank fuel pump as the v8 TPI. (V8 TBI uses a lower pressure pump.) At least you don't have to drop the tank down!
Oh duh, didn't notice you had found a TPI motor already. In that case, you won't have to rebuild the v8 donor car's motor..
-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.v6fbody.com mailbags
and switch everything over. While you're at it, clean up the Firebird's engine bay too...The only bonus you get is if you buy a v8 with TPI injection, the v6 MPFI motor uses the same in-tank fuel pump as the v8 TPI. (V8 TBI uses a lower pressure pump.) At least you don't have to drop the tank down!
Oh duh, didn't notice you had found a TPI motor already. In that case, you won't have to rebuild the v8 donor car's motor..
-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.v6fbody.com mailbags
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