What is the largest engine 3rd gens can take?
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From: 212 is up in this Bit@#
Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: What is the largest engine 3rd gens can take?
Neither a Short or Tall Deck BBC fit well...
(Headers especially)
But the Tall Deck Engines are definitely worse.
(Headers especially)
But the Tall Deck Engines are definitely worse.
Joined: Oct 2001
Posts: 12,217
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: What is the largest engine 3rd gens can take?
Nothing like a little 632 bbc
Joined: Sep 2005
Posts: 27,893
Likes: 2,436
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: What is the largest engine 3rd gens can take?
That thing is NOTHING LIKE "putting an ENGINE into a CAR". It's more like, "wrapping a CAR around an ENGINE". 
Thread Starter
Senior Member
Joined: Dec 2004
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From: TEXAS
Car: 1987 IROC-Z
Engine: 6.2L
Transmission: Stage III T56
Axle/Gears: 3.73
Joined: Mar 2001
Posts: 10,412
Likes: 2,083
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: What is the largest engine 3rd gens can take?
I had a standard deck oval port BBC in my car and it fit fine but like said earlier the exhaust options are not great. I had Lemons make me some tri-Y headers that ran down the tunnel like a set of SBC long tubes would. But after all that you'll still have to use a wheezy intake to clear a stock hood. If you don't mind a cowl then you can get a proper intake and let the engine breath more.
Honestly, a BBC is rather silly unless you build a drag car and get happy with using a cowl hood. If you want a fast car that can corner then get a stroker aluminum SBC or LS engine. The LS engine will fit under a stock hood unless you want a single plane intake.
Honestly, a BBC is rather silly unless you build a drag car and get happy with using a cowl hood. If you want a fast car that can corner then get a stroker aluminum SBC or LS engine. The LS engine will fit under a stock hood unless you want a single plane intake.
Joined: Oct 2001
Posts: 12,217
Likes: 1,141
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: What is the largest engine 3rd gens can take?
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Joined: Aug 2013
Posts: 4,809
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From: MICHIGAN
Car: 1988 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 10 Bolt 2.73 Open
Re: What is the largest engine 3rd gens can take?
A lousy picture for trying to see engine install detail, but it shows you a Rat can fit in quite nicely, and look fairly stock doing it.
First photo in this post. https://www.thirdgen.org/forums/memb...ml#post6470695
First photo in this post. https://www.thirdgen.org/forums/memb...ml#post6470695
Thread Starter
Senior Member
Joined: Dec 2004
Posts: 570
Likes: 69
From: TEXAS
Car: 1987 IROC-Z
Engine: 6.2L
Transmission: Stage III T56
Axle/Gears: 3.73
Re: What is the largest engine 3rd gens can take?
I had a standard deck oval port BBC in my car and it fit fine but like said earlier the exhaust options are not great. I had Lemons make me some tri-Y headers that ran down the tunnel like a set of SBC long tubes would. But after all that you'll still have to use a wheezy intake to clear a stock hood. If you don't mind a cowl then you can get a proper intake and let the engine breath more.
Honestly, a BBC is rather silly unless you build a drag car and get happy with using a cowl hood. If you want a fast car that can corner then get a stroker aluminum SBC or LS engine. The LS engine will fit under a stock hood unless you want a single plane intake.
Honestly, a BBC is rather silly unless you build a drag car and get happy with using a cowl hood. If you want a fast car that can corner then get a stroker aluminum SBC or LS engine. The LS engine will fit under a stock hood unless you want a single plane intake.
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: What is the largest engine 3rd gens can take?
My tall deck 555 fits fine with 4” cowl and motor plates and custom fabbed headers.
a tall deck can get you 632” and 900-1000 hp all motor easily for a streetable machine
a custom sheet metal intake would be needed for stock hood clearance and im not sure how much room there is with stock hoods
a tall deck can get you 632” and 900-1000 hp all motor easily for a streetable machine
a custom sheet metal intake would be needed for stock hood clearance and im not sure how much room there is with stock hoods
Supreme Member
Joined: Jul 2006
Posts: 2,867
Likes: 789
From: 212 is up in this Bit@#
Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: What is the largest engine 3rd gens can take?
Before having to move the Cylinder-Bore Centers (via an Aftermarket Cylinder Block)...
As Orr89Rocz just said; with the very last 0.025 (Cylinder-Bore diameter) of an Inch, of safety (Cylinder-Wall thickness)...
638 Cubic Inches is as Big as things can get (BBC GM Tall-Deck Cylinder-Block).
Aftermarket BBC Cylinder Blocks are another story...
Depending on the Manufacturer, 900+ to 1,000+ Cubic Inches are on the table!
As Orr89Rocz just said; with the very last 0.025 (Cylinder-Bore diameter) of an Inch, of safety (Cylinder-Wall thickness)...
638 Cubic Inches is as Big as things can get (BBC GM Tall-Deck Cylinder-Block).
Aftermarket BBC Cylinder Blocks are another story...
Depending on the Manufacturer, 900+ to 1,000+ Cubic Inches are on the table!
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