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.

Which Engine?

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Old Jan 6, 2006 | 11:21 AM
  #1  
19kilo's Avatar
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From: Milton FL near Pensacola FL
Car: 1985 Z-28 2003 chevy Silverado Z71
Engine: was 305 LG4 now 355 HO
Transmission: TH700r4
Axle/Gears: posi 373
Which Engine?

i've been looking for a new engine to put in my 1985 Z-28 now out of these two which one is better?

http://cgi.ebay.com/ebaymotors/CHEV-...QQcmdZViewItem

OR

http://cgi.ebay.com/ebaymotors/CHEVY...QQcmdZViewItem

I have a 2,000 limit on engine i well need to buy the headers and Carb.

Last edited by five7kid; Jan 6, 2006 at 11:48 AM.
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Old Jan 6, 2006 | 11:45 AM
  #2  
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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
Neither.

http://www.rebuilt-auto-engines.com/...55106133614.f7 Call them up and tell them what you're doing, they'll fix you up right.

Buy a Performer or Action+ EGR intake manifold. Use your stock carb & distributor.
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Old Jan 6, 2006 | 11:48 AM
  #3  
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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
(Sorry, I just had to edit your "witch". Don't want your project to start off with a spell on it...)
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Old Jan 7, 2006 | 11:19 AM
  #4  
19kilo's Avatar
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From: Milton FL near Pensacola FL
Car: 1985 Z-28 2003 chevy Silverado Z71
Engine: was 305 LG4 now 355 HO
Transmission: TH700r4
Axle/Gears: posi 373
LOL thanks man
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Old Jan 11, 2006 | 01:46 AM
  #5  
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From: The Gem State
Car: 82 Firebird, 71 LeMans
Engine: GMPP 350, 400 PMD
Transmission: TH-350
What about this one:

http://www.jegs.com/webapp/wcs/store...0763&langId=-1

Or this:

http://www.jegs.com/webapp/wcs/store...0763&langId=-1

Last edited by elky74; Jan 11, 2006 at 01:49 AM.
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Old Jan 11, 2006 | 06:34 AM
  #6  
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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
1st one: Okay, but poor heads, low compression, upgrades pretty much requires changing everything but the block, crank & rods.

2nd one: Okay, requires Vortec-specific intake manifold. Not emissions-friendly. Busts the stated budget.
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Old Jan 18, 2006 | 07:32 PM
  #7  
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From: Madison, WI
Car: 1986 Camaro Z28
Engine: 400
Transmission: T5
Axle/Gears: 10 bolt Posi 3.73
Remember too that the rest of your car will have diffculties handling a 300 HP crate motor. I do not believe your tranny is going to like the beating that motor will give it. Your rear end is also going to be suffering. five7 this is true right?

On a side note, how do you think my 412 sbc ( say 450 ft/lbs of torque) will be with my non-WC tranny and stock 3.23 posi rear end. Both are in my 86 Z28. Should be ok as long as I don't pound on it right?
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Old Jan 19, 2006 | 11:31 AM
  #8  
five7kid's Avatar
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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
TH700's can handle 300 HP if treated to upgrades such as pressure relief valve and Vette servo. Typically, though, they will wear out and need a rebuild soon, anyway. They can easily handle 400 HP with fairly basic rebuild stuff, 600 with more expensive pieces upgraded.

T5's, whether WC or not, can be destroyed by a stock LG4. A $2000 kit (I forget exactly how much it costs - figures of $1600 to $2400 are bouncing around in my head) will cure that problem. But, like you said, if you don't pound it (no clutch dumps, no speed shifting), it'll last a long time behind most any engine.
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Old Jan 21, 2006 | 06:50 PM
  #9  
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From: Bay Area/Santa Barbara
Car: '92 Camaro RS - gone
Engine: 305 TBI
Transmission: T-5
Originally posted by five7kid
Neither.

http://www.rebuilt-auto-engines.com/...55106133614.f7 Call them up and tell them what you're doing, they'll fix you up right.

Buy a Performer or Action+ EGR intake manifold. Use your stock carb & distributor.
Would this be a decent engine, for Cali emmissions, to throw an Edelbrock intake, Hedmann headers, full 3 in exhaust, retaining the AIR, and a TBI on? How much power would I be looking at here? I liked the price. And also the 4-bolt mains kinda turn me on

Im trying to decide whether to go with something like this... or an LT1...
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Old Jan 22, 2006 | 12:02 AM
  #10  
five7kid's Avatar
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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
Shouldn't be a problem. You may have to do some PROM tuning (TBI forum has more info on that). Power probably in the L98 range or better.
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