TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

lt1 heads?

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Old Aug 15, 2003 | 10:34 PM
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92 305 BIRD's Avatar
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From: BAKERSFIELD
Car: 1992 Firebird
Engine: 305 TBI (LO3)
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lt1 heads?

will lt1 heads and cam go right in my 305 tbi? and if so what all would i have to do?and if not what would i have to do to make them? thanks
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Old Aug 15, 2003 | 11:16 PM
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From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Sorry but.....

Best thing to do here is forget it. Very costly.
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Old Aug 15, 2003 | 11:25 PM
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You can't use LT1 heads. The closest to them are Vortec heads.

But an LT1 cam will work. Although it'd be a waste with Vortec heads IMHO

The LT1 heads are "reverse cooling" heads. They take A LOT of mods to work with a Gen I block.

Are they going on your 305?
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Old Aug 16, 2003 | 12:53 AM
  #4  
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From: BAKERSFIELD
Car: 1992 Firebird
Engine: 305 TBI (LO3)
Transmission: TH-700R4 w/Shift kit
my friend has a 94 z28 and he is turning his lt1 into an lt4 and he is going to give me his heads and cam and he was going to give me his intake but i found out that it takes alot to make that work so i told him to keep it. but what heads would be best with a lt1 cam?
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Old Aug 16, 2003 | 12:55 AM
  #5  
92 305 BIRD's Avatar
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From: BAKERSFIELD
Car: 1992 Firebird
Engine: 305 TBI (LO3)
Transmission: TH-700R4 w/Shift kit
i posted right after i posted the topic about corvette heads b/c im not for sure what the rpo is but its a 350 i think 78 or 80 something and i was wondering if those heads would work?
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Old Aug 20, 2003 | 09:22 PM
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Car: '90 RS
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You would be better off getting some world products Sr torquer 305 heads or some milled vortecs. Both will run you 600-700 bucks and will be a direct bolt on that can take a serious cam.
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Old Aug 20, 2003 | 10:32 PM
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The LT1 intakes are pretty good with a 7730 ECM and harness swap.
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Old Aug 21, 2003 | 06:10 AM
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Aluminum LT1 heads from a Gen II LT1 engine (1992-1997 applications) can be modified to flow coolant like a conventional Gen I head so it really has been done before..... but since you're asking this question, you probably don't have the skills to do the work. Technically what can be done for the aluminum heads can also be done for the iron LT1 heads, but welding cast iron is MUCH more tricky than welding aluminum -- so you may as well forget about altering the iron LT1 heads.

There are threads on either the TPI or Engine Technical forums here on 3rd gen that discuss using Gen II LT1 heads on Gen I engine blocks (links are listed there too), if you really want to learn more about it and what's involved. Then you can decide if it's worth pursuing.

If you really want aluminum heads and don't have the DIY fabrication skills needed to mod the LT1 heads, then L98 Ycar heads would be the inexpensive bolt-on choice. Aftermarket (and newer) aluminum heads would flow better than the L98s, but they'll also cost a lot more money. HTH.

Last edited by kdrolt; Aug 21, 2003 at 06:13 AM.
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