1991 5.7 z28 motor

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Jul 11, 2004 | 06:53 PM
  #1  
I've been looking all over and can't find anything I'm looking for Can anyone help me or point me to a place where I can find this info?

(i bought the engine for my 85 camaro w/ a 305 in it right now, gonna do the swap in Aug.)

1-when i put the engine in, should i expect the same performance that a 91 z28 gets?
2-Any idea what to expect for 1/4 mile times?
3-Will I need a new tranny to handle the hp?
4-Should I get a 3.73 rear end gear with my new motor?

Thanks for taking the time to look and for any help I get!!

JC
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Jul 11, 2004 | 06:55 PM
  #2  
You need to tell us what's in and on the motor. I can build you a 350 with under 150 hp. Telling me the size of the motor really isn't telling me much else.
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Jul 11, 2004 | 06:58 PM
  #3  
all i know is that its the complete motor out of a 1991 5.7 z28. same cam, headers..ect..thats all i know
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Jul 11, 2004 | 07:01 PM
  #4  
1. Roughly, yes.

2.

3. Don't know what you have.

4. Probably not.
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Jul 11, 2004 | 07:03 PM
  #5  
sorry, i had the tranny in my profile before..
its just the stock 4 speed auto.

i tried searching for the 1/4 times, but i can only find times of modified cars
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Jul 11, 2004 | 07:27 PM
  #6  
When my '91 had about 100k miles and was stock with the exception of 3.73 gears and k&n's it ran 14.5, 14.4, and 14.2 on a very hot day.
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Jul 11, 2004 | 11:23 PM
  #7  
Quote:
Originally posted by slow91camaro
When my '91 had about 100k miles and was stock with the exception of 3.73 gears and k&n's it ran 14.5, 14.4, and 14.2 on a very hot day.
any idea what it ran w/out the 3.73?
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Jul 11, 2004 | 11:38 PM
  #8  
Are you planning on running your Qjet on this motor or TPI because they could make a pretty big difference. The L98 wasnt exactly made for a Qjet it was made for the low end torque of TPI. But I am sure if you get an aftermarket intake and tune the carb you can make it even better than it would be with TPI, you just wouldnt see the same stock numbers. If I were you I would at least get a better cam while the motor is out and a better intake and full exhaust to match then you wont have to worry about stock L98 times.
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Jul 11, 2004 | 11:59 PM
  #9  
Quote:
any idea what it ran w/out the 3.73?
No, sorry. The diff took a dump right after I got the car. I believe there is someone local (SoCal) who ran a 14.59 on a bone stock '91 GTA.
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Jul 12, 2004 | 12:22 AM
  #10  
Quote:
Originally posted by IROCaholic
Are you planning on running your Qjet on this motor or TPI because they could make a pretty big difference. The L98 wasnt exactly made for a Qjet it was made for the low end torque of TPI. But I am sure if you get an aftermarket intake and tune the carb you can make it even better than it would be with TPI, you just wouldnt see the same stock numbers. If I were you I would at least get a better cam while the motor is out and a better intake and full exhaust to match then you wont have to worry about stock L98 times.
thanks for the help man, you all kick ***
:hail: :hail: :hail:
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Jul 12, 2004 | 01:19 AM
  #11  
if i dished out 2 grand in my maro after i put the engine in, would it be possible to get anything in the 12's?
thats all my gf will let me spend on it lol
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Jul 12, 2004 | 12:41 PM
  #12  
Quote:
Originally posted by jc265
if i dished out 2 grand in my maro after i put the engine in, would it be possible to get anything in the 12's?
thats all my gf will let me spend on it lol
You could easily hit 12's with $2000 after you buy the motor,just look at GZGLR's setup. Hes running an L98 with the Lt4 hot cam, vortec heads, a performence intake and exhuast, 3.42 gears, and an edelbrocke carb and is running low 12's. So if you have $2000 after you get the motor you could easily build a setup with numbers like his as long as you get your combo right.
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