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87 formula 350 performance

Old Nov 25, 2008 | 09:14 PM
  #1  
unibuga's Avatar
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
87 formula 350 performance

i have an 87 formula 350 and i was wondering what are some basic performance upgrades i should do to the car?

right now it has...

3" cat back exhaust
.30 bore
ported plenum
ported heads im assuming
accel super coil
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Old Nov 25, 2008 | 09:28 PM
  #2  
RedHawkLB9's Avatar
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Car: 89 Formy
Engine: carbed 355ci
Transmission: A4
Axle/Gears: 3.73 10 Bolt
Re: 87 formula 350 performance

headers in a must...then maybe a lil more gear
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Old Nov 25, 2008 | 09:34 PM
  #3  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
Re: 87 formula 350 performance

yeah i was thinking about header cut outs...but i didnt know what kind of headers i should get yet
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Old Nov 25, 2008 | 09:37 PM
  #4  
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From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: 87 formula 350 performance

shorty headers would be easiest to install but long tubes would prob perform better, do you have to stay emissions legal?
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Old Nov 25, 2008 | 09:48 PM
  #5  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
Re: 87 formula 350 performance

yes but i know some people so that wont really be a prob
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Old Nov 25, 2008 | 09:55 PM
  #6  
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From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: 87 formula 350 performance

my understanding has it that with most longtubes you have to pull the motor to put them in. Have you considered a cam swap? if you swap the cam put a good set of headers on it, you'll waste you money otherwise. I would go longtube, but thats just me.
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Old Nov 25, 2008 | 09:58 PM
  #7  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
Re: 87 formula 350 performance

yes i would like to do a cam swap i just dont have the time to pull the motor my self but maybe i could get a local shop to do it
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Old Nov 25, 2008 | 11:01 PM
  #8  
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From: South Carolina
Car: 85 2M6, 87 'Bird 88 'burb
Engine: LX9, LG4, L05
Transmission: F23, 700r4, 700R4
Axle/Gears: 3.63, 2.73, 4.10
Re: 87 formula 350 performance

Originally Posted by unibuga
3" cat back exhaust
.30 bore
ported plenum
ported heads im assuming
accel super coil
did you buy the car this way or do all of this yourself?

also, not to put ya down, but a .030 overbore does nothing significant for performance, neither does a .060 overbore.
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Old Nov 26, 2008 | 03:40 AM
  #9  
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From: Minneapolis, MN
Car: currently a 91 G92.
Engine: 305TPI
Transmission: Borg Warner WC 5 speed
Axle/Gears: 3.42
Re: 87 formula 350 performance

Also, a ported plenum doesn't necessarily mean ported heads. What is the basis for your assumption? You don't have to pull the engine out to install long tube headers. I would also consider a wide band tune. As far as the gearing is concerned, 3.73 I think is plenty of gear. What do you want to do with the car? This is the question you must ask yourself in order to decide which way to go.
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Old Nov 26, 2008 | 11:05 AM
  #10  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
Re: 87 formula 350 performance

yes i bought it that way...the owner was my dads friend and he said when they put it on the dyno it gained about 80 lbs of torque but thats just what he said
----------
Originally Posted by Saculia
Also, a ported plenum doesn't necessarily mean ported heads. What is the basis for your assumption? You don't have to pull the engine out to install long tube headers. I would also consider a wide band tune. As far as the gearing is concerned, 3.73 I think is plenty of gear. What do you want to do with the car? This is the question you must ask yourself in order to decide which way to go.

he said it was bored out so i assumed the heads would be ported but im still in contact with the old owner so i could ask him

as far as the car goes id like it the be a quick street car...maybe 12.50s somthin like that

Last edited by unibuga; Nov 26, 2008 at 11:08 AM. Reason: Automerged Doublepost
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Old Nov 26, 2008 | 02:58 PM
  #11  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Being bored .030" over (not .30" over) has nothing to do with ported heads. Rarely do they come together.

Hooker 2055HKR headers - emissions legal (and yes, you are required to keep it emissions-legal), best y-pipe out there for off-the-shelf headers. Only other choice to consider is from TGO member Dyno Don.
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Old Nov 26, 2008 | 05:32 PM
  #12  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
Re: 87 formula 350 performance

i guess ill just have to ask the previous owner
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Old Nov 26, 2008 | 10:52 PM
  #13  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
formula 350

ok what should i do to my 87 formula 350 to be a 12.50 street legal car
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Old Nov 27, 2008 | 09:22 AM
  #14  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
formula 350

i have an 87 formula 350 i want to make it into a 12.50 street legal car.
and i will be driving it every day.
what should i do to it?
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Old Nov 27, 2008 | 10:50 AM
  #15  
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: formula 350

I'm not going to venture an opinion without first asking some questions. Nitrous or no? Boost or no? Stock short-block or willing to upgrade if necessary? Modest rpm and loads of torque, or high rpm horsepower?
----------
What's the budget? What's it running now? Mid-15s?

Last edited by Atilla the Fun; Nov 27, 2008 at 10:51 AM. Reason: Automerged Doublepost
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Old Nov 27, 2008 | 12:07 PM
  #16  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
Re: formula 350

well its not running completely right yet but i was thinking headers intake and ecu first it should run mid 14s right now. i don't really have a budget yet ...id like to keep the stock engine just beef it up a little.no nitrous maybe a super charger if i can find a kit for it
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Old Nov 27, 2008 | 12:15 PM
  #17  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
You really don't need to keep starting new threads. I'm either going to merge them, or delete them.
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Old Nov 27, 2008 | 12:17 PM
  #18  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
Re: 87 formula 350 performance

ok then well whats your opinion on what i should do to the car?
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Old Nov 27, 2008 | 12:30 PM
  #19  
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From: Kemah, Tx
Car: 1991 z28
Engine: Turbo 310
Transmission: T56
Axle/Gears: D44
Re: 87 formula 350 performance

bring it out to the friday night car show by highway 3 in league city tomorrow, and then to the show sat night infront of homedepot saturday in kemah so i can see it! ill be at both hopefully in my dark red 91z28
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Old Nov 27, 2008 | 12:32 PM
  #20  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Why do you have "LT1" in your user information?

Assuming this is a TPI car:

Cam, headers, Super Ram, whatever is required to support those.
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Old Nov 27, 2008 | 06:22 PM
  #21  
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From: Bacliff,TX
Car: 87 firebird formula 350
Engine: l98
Transmission: 700r4
Axle/Gears: 3.73
Re: 87 formula 350 performance

Originally Posted by sailtexas186548
bring it out to the friday night car show by highway 3 in league city tomorrow, and then to the show sat night infront of homedepot saturday in kemah so i can see it! ill be at both hopefully in my dark red 91z28
ill try to make it ...
where on high way 3 is the show on friday
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