Hi quick question I have a 84 firebird that a 4.3l v6 that I want to switch to a 94 lt1 carburetor. The lt1 still has the fuel injection on it please tell me everything I need to know about switching it over to carburetor and so that it will fit my 84 firebird? Thanks[/QUOTE]

 

Welcome aboard thirdgen.org.

In my opinion (and I realize this is not a fully-shared opinion), the first step when converting an LT1 to carb is to get a lobotomy.

So, my question would be, "Why do you want to convert a fine EFI system to carb."

Also, who swapped in the 4.3 V6 you have now? An '84 f-body V6 would have been a 2.8l.

 

Don't have the computer plus I bought the motor so it has to be put on.
Has to be used since I bought it

 

Why not buy what you need to complete the EFI system?

 

The cost and the wiring is crazy and my mechanic doesn't want to deal with it

 

My going-in assumption on the Engine Swap forums is the work will be done by the owner. When you put a shop into the mix, having to make a profit usually makes it too expensive to be economically viable.

But, that doesn't stop some people...

You need an intake manifold:
http://www.summitracing.com/parts/nal-24502592

And a distributor. Most any vacuum/mechanical large cap HEI stand-alone distributor will work. Something like this: http://www.summitracing.com/parts/SUM-850001R/

You have to decide what to do with the Optispark - keep it in place to plug the hole, or remove the drive shaft and plug the hole somehow. Note the "suggested parts" in the Summit link (and which type of cover you need to use - '94 won't work).

You'll need some way to set the timing. You could use a piston stop to mark TDC on the existing damper, but if you ever remove it, you'll need to remark it because the damper isn't keyed (don't know off the top of my head if the crank is - that's something you'll have to figure out). But that will only give you TDC, and I doubt the typical SBC timing tape will fit on a stock damper. So, you'd better figure on a damper with timing marks: http://www.summitracing.com/parts/PFS-80030/

So, intake manifold, $290. HEI distributor, $90 (unless you want to take a chance on a cheap Chinese eBay HEI). Front cover plug & timing pointer, $65. Damper, $115. Carb - oh, shall we just ballpark it at $400?

Plus the nickle & dime stuff, ballpark that at $300 (it's always more than it seems like it should be). Oil pump drive shaft, gaskets, hoses, throttle cable, etc.

That's a bit over a grand.

And you still need to pay the mechanic to make all those changes, plus the changes to the car needed to install the engine, plus labor to install the engine.

And that's assuming the water pump, alternator, and power steering pump are okay (did you even get that stuff with the engine?).

What were your plans for a transmission?

One of the worst reasons to justify using a particular engine to swap into a 3rd gen is because you already have it. Again, not saying it can't (or shouldn't) be done, but you need to be realistic about what it's going to take.

You might be better off listing the LT1 on craigslist or eBay and getting a more common, already-carbureted 350. Which are admittedly becoming less common, but even an EFI truck 350 (rough year model range of 1988-1999) would be less expensive to get running than your LT1 would be. And it could be argued that a '96-'99 truck Vortec 350 would run every bit as well as the LT1 (with possibly a cam upgrade).