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88 iroc-z 305 to 350 engine swap

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Old Nov 2, 2009 | 01:34 PM
  #1  
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
88 iroc-z 305 to 350 engine swap

i am currently in the process of swapping a 350 into my iroc. the engine is from a 1995 silverado 1500. will my stock fly wheel fit or do i need to get another.
Attached Thumbnails 88 iroc-z 305 to 350 engine swap-photo.jpg   88 iroc-z 305 to 350 engine swap-photo3.jpg   88 iroc-z 305 to 350 engine swap-photo2.jpg  
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Old Nov 3, 2009 | 01:45 PM
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Car: 88IROC vert and a 83 w/evo body
Engine: 400 and 350
Transmission: T56 and 700R4
Axle/Gears: 323 and 373
Re: 88 iroc-z 305 to 350 engine swap

You should be good to go.
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Old Nov 3, 2009 | 02:18 PM
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

thanks for the info!!!
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Old Nov 3, 2009 | 02:21 PM
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

more pics
Attached Thumbnails 88 iroc-z 305 to 350 engine swap-12.jpg  
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Old Nov 4, 2009 | 07:43 AM
  #5  
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From: Doghouse ······································ Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45
Re: 88 iroc-z 305 to 350 engine swap

I thought this would be better served in the Tech/General Engine forum.

John
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Old Nov 18, 2009 | 01:31 AM
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

new pics took off old 305 and painted the plenum. should be ready in a week or so
Attached Thumbnails 88 iroc-z 305 to 350 engine swap-off-motor.jpg  
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Old Nov 19, 2009 | 08:01 PM
  #7  
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From: PA
Car: 1985 trans am
Engine: 1969 chevy 350 .060 over
Transmission: 5spd
Re: 88 iroc-z 305 to 350 engine swap

wile you have the engine out you should clean up under the hood and maybe spray paint it

it not only looks good, but if you ever sell it, it will seem like you did a lot of work not just an engine swap
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Old Nov 20, 2009 | 03:51 PM
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

New Pics of the engine bolted up to the tranny and ready to go
Attached Thumbnails 88 iroc-z 305 to 350 engine swap-done3.jpg   88 iroc-z 305 to 350 engine swap-done2.jpg   88 iroc-z 305 to 350 engine swap-done1.jpg  
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Old Nov 25, 2009 | 05:24 PM
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

im having a problem with my 305 to 350 engine swap the block is a 350 from a 95-00 silververado 1500 i had to change the heads so the intake manifold would fit but now when i put in my stock distributor from my old 305 it wont fit correctly.it seems to be about 1/2 inch to tall.could it be that im not putting it in correctly or is it that i need to get a new one that will fit. has anyone had this problem or does anyone have any tips or ideas that will fix my problem. THANKS!!!
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Old Nov 25, 2009 | 05:37 PM
  #10  
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From: West-Central
Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: 88 iroc-z 305 to 350 engine swap

It could be the oil pump shaft not aligning up correctly with the distributer drive. In this case you would need a oil pump primer, then turn the oil pump shaft little by little untill you can get the distributor drive to hook in to the shaft.
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Old Nov 25, 2009 | 06:03 PM
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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
Originally Posted by thomas1976
It could be the oil pump shaft not aligning up correctly with the distributer drive.
I'd put it slightly differently - it is the oil pump shaft not aligning up correctly with the distributor drive. You can try to move the pump shaft so it aligns when you drop in the distributor, or you can put it in like you did, bump the engine over until it lines up and drops down.
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Old Nov 25, 2009 | 08:38 PM
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From: CALI
Car: 85' Trans Am !best car ever!
Engine: 305tpi 215hp LB9 two bolt,
Transmission: th-700r4
Axle/Gears: stock (3.27)
Re: 88 iroc-z 305 to 350 engine swap

make sure the dizzy gear isnt upside down. like the dude said, get a long screw drive and align the oil pump shaft. happy turkey turk
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Old Nov 25, 2009 | 10:26 PM
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

Thanks alot to all i will try in the morning and see if the tips fix my problem, Happy Thanksgiving to all!!!
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Old Nov 30, 2009 | 12:33 PM
  #14  
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

thanks it work i finally got the distributor in. i tried turning on the car but it wont start. it turns over but it wont start. i then sprayed carb cleaner into the throttle body and started and it ran for like 10 seconds. i was thinking maybe im not getting enough fuel to the the injectors. maybe my 305 fuel pimp is not strong enough for the 350?does anyone know what might be the problem.
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Old Nov 30, 2009 | 01:46 PM
  #15  
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From: Doghouse ······································ Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45
Re: 88 iroc-z 305 to 350 engine swap

It sounds like a Fuel problem, at least that is where I would start... The 305 & 350 FP are identical, so it would not be the difference in the pump.

Here is a checklist for you...
1) when you turn your car on, can you hear the fuel pump running?
2) If not, can you hear the solenoid click.
3) Check the schrader valve on the passenger side of the intake to see if you are getting fuel pressure.

If the car ran before the swap, and now it is not running, then it is probably something simple... It may be a bad ground on the fuel injectors... If it was a wire, then it should run really rough, but a ground would not let it fire at all...

John
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Old Nov 30, 2009 | 02:53 PM
  #16  
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

it was running before the swap. i can here the fuel pump turn on, if it is a bad ground is it one of the three wires that bolt on to the passenger side head?
THANKS!!!
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Old Nov 30, 2009 | 04:16 PM
  #17  
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From: Doghouse ······································ Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45
Re: 88 iroc-z 305 to 350 engine swap

It might be the body ground cable that attaches to the head, but if it was that I would suspect other things might not work either... I would start checking continuities, and injectors. It sounds like a Fuel problem...

John
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Old Dec 1, 2009 | 02:10 PM
  #18  
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From: Las Vegas
Car: 88 Iroc-Z Convertible
Engine: 350 TPI
Transmission: 700r4
Axle/Gears: 3.27
Re: 88 iroc-z 305 to 350 engine swap

im not familiar with the term continuity, what is it so i can check if it fixes the problem? Thannks
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Old Dec 1, 2009 | 03:34 PM
  #19  
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From: Doghouse ······································ Car: 1989 Formula 350 Vert Engine: 350 L98 Transmission: 700R4 Axle/Gears: B&W 3.27
Car: 87 Formula T-Top, 87 Formula HT
Engine: 5.1L TPI, 5.0L TPI
Transmission: 700R4, M5
Axle/Gears: Sag 3.73, B&W 3.45
Re: 88 iroc-z 305 to 350 engine swap

Make sure there is a Continuous connection...

Continuity comes from the word continuous.

John

Last edited by okfoz; Dec 1, 2009 at 03:38 PM.
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