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Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

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Old 04-22-2009, 08:18 PM   #1
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Join Date: Mar 2009
Location: Wilmington, DE
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Car: 87 IROC-Z
Engine: jasper 350
Transmission: 700R-4
Axle/Gears: 2.73 posi

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'87 305 TPI swap to 350 TPI

I know there are a lot of swap threads but, i haven't found a straight answer. I have a '87 IROC with a 305 LB9 but it has a rod knock so i need a new motor. I want to put a 350 in there but what do i need to replace? Do i need to reprogram my computer? If possible i would prefer a 350 vortec but i'm not sure how much work that will be and if its worth it.
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1987 Camaro IROC-Z
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Old 04-23-2009, 08:18 PM   #2
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Join Date: Mar 2009
Location: Wilmington, DE
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Car: 87 IROC-Z
Engine: jasper 350
Transmission: 700R-4
Axle/Gears: 2.73 posi

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Re: '87 305 TPI swap to 350 TPI

anyone? well i was talking with howell auto and they said that for the computer i need to get a prom for a 350?
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1987 Camaro IROC-Z
Exterior
350/700R4
T-Tops
Flowmaster Exhaust
Smoked Tail Lights
180 Degree Thermostat
2055 Hooker Headers
Front Slotted Disk Brakes with HAWKS Pads

Interior
New Black carpet all around
Black Plastics all around
4th gen seats
Pioneer Headunit
Pioneer 4x6 speakers in dash
Kenwood 6x9 speakers in sail panels

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Old 04-24-2009, 12:06 AM   #3
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Join Date: Mar 2009
Location: Bloomfield, IN
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Car: 87 Camaro, 86 Trans Am
Engine: 305, 305
Transmission: 700R4

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Re: '87 305 TPI swap to 350 TPI

You'll need to burn the prom for the 350 settings or just get the 350 computer altogether, the block obviously, and you'll need larger injectors. I think thats about it.
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Old 04-24-2009, 04:05 PM   #4
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Join Date: Mar 2000
Location: Littleton, CO USA
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Car: 82 Berlinetta(2)/57 Bel Air
Engine: LS1 (LS1)/LQ4
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Axle/Gears: 10B 3.73(9" 4.11)/8.2" 4.11

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'87 is MAF, which is pretty forgiving to displacement changes. You can always expect to get better performance out of the car with PROM tuning, but it isn't a must-have.

Knock sensor and module should be changed to 350 parts.

Injectors are optional. 22 lb 350 injectors give you WOT margin, but 19 lb will usually do the job.
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Old 04-25-2009, 07:53 PM   #5
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Join Date: Mar 2009
Location: Wilmington, DE
Posts: 99
Car: 87 IROC-Z
Engine: jasper 350
Transmission: 700R-4
Axle/Gears: 2.73 posi

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Re: '87 305 TPI swap to 350 TPI

what is the better of the low cost GM crate engines?
__________________


1987 Camaro IROC-Z
Exterior
350/700R4
T-Tops
Flowmaster Exhaust
Smoked Tail Lights
180 Degree Thermostat
2055 Hooker Headers
Front Slotted Disk Brakes with HAWKS Pads

Interior
New Black carpet all around
Black Plastics all around
4th gen seats
Pioneer Headunit
Pioneer 4x6 speakers in dash
Kenwood 6x9 speakers in sail panels

87SnowFlake is offline vBGarage Page   Reply With Quote
Old 04-25-2009, 07:53 PM
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