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Old 08-05-2005, 01:46 AM   #1
firebird2850
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pontiac firebird and 400 small block

iv got a 400 small block and im wonderin if it is possible to put that into my v6 1989 pontiac firebird and also wonderin what kind of work i would need to do
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Old 08-05-2005, 01:58 AM   #2
99integra
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How the hell do you come up with a 400 small block
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Old 08-05-2005, 02:38 AM   #3
firebird2850
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got it of a chevy
y u surprised
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Old 08-05-2005, 02:39 AM   #4
99integra
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Because you can't have a 400 small block, it would have to be considered a big block then
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Old 08-05-2005, 02:42 AM   #5
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iv got it in my garage right now
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Old 08-05-2005, 02:43 AM   #6
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I believe it was actually considered a long block.
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Old 08-05-2005, 02:45 AM   #7
firebird2850
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every where else it says its a small block 400
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Old 08-05-2005, 03:56 AM   #8
corbett_auto
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Chevy made a 400 small block it is based on the 350 with a larger bore and a longer stroke. if you put a 400 crank into a 350 block you can make 383.

It would not be an easy job. but it is do-able. I'm sure i will miss something but here what I would say would have to be changed:
  • exhaust
  • tie up un-needed wires
  • motor mounts (unsure)
  • fan shroud
  • radiator (might need a larger one)
  • fuel lines

I'm sure there is more, but thats all I can think of at the moment.
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Old 08-05-2005, 04:17 AM   #9
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if the motor mounts need changed, that could affect the placement of the trans mount and crossmember? and then you might have to shorten or lengthen the driveshaft. i would say definately heavier front coil springs though.
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Old 08-05-2005, 04:42 AM   #10
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Well you gotta remember its only an '89 Firebird, so therefore it would still need emissions would it not? I'm guessing the engine is probably older then the car and may not pass emissions.
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Old 08-05-2005, 05:35 AM   #11
dodger65
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Quote:
Originally Posted by corbett_auto
Chevy made a 400 small block it is based on the 350 with a larger bore and a longer stroke. if you put a 400 crank into a 350 block you can make 383.

It would not be an easy job. but it is do-able. I'm sure i will miss something but here what I would say would have to be changed:
  • exhaust
  • tie up un-needed wires
  • motor mounts (unsure)
  • fan shroud
  • radiator (might need a larger one)
  • fuel lines

I'm sure there is more, but thats all I can think of at the moment.

you've spent too much time on older cars, corbett...
  • exhaust (just need y-pipe & possibly converter, depending on y-pipe)
  • tie up un-needed wires
  • motor mounts (parts store, 305 or 350 car)
  • fan shroud (not required, electric fan...)
  • radiator (parts store, 305 or 350 car--check pn's, v8 & v6 might be the same rad)
  • fuel lines (depends on induction system, you may have to reroute to the pass. side if you're going w/ a mech. fuel pump)
  • transmission (you can use almost anything that will bolt up to a sbc--th2004r. th350, th400, th700r4, it's just a matter of what other folks decide your opinion is)
  • bunch of other miscellaneous crap, depends on whether you go carb, tbi, tpi, etc...
you'll probably want to swap the trans crossmember for an earlier one, b/c yours has the crappy rubber isolator setup (earlier cars are one solid piece)

good luck!

ps: for the record, a 383 is a 350, .060 over, w/ a 400 crank...
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Old 08-05-2005, 10:57 AM   #12
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Well damn, I just learned something
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Old 08-05-2005, 06:36 PM   #13
72firebird
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yea and actualy they even have 454 small blocks. world products blocks are cool like that. you can get 427 and 454s from there 350 blocks
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Old 07-18-2006, 02:28 AM   #14
1991Firebird400
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400 Engine swap

I have made the 305 to 400 swap and oh man was there more to it than i thought. Does anybody know if there is a smaller slave cylinder replacement for a 1991 manual tranny?
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Old 07-18-2006, 02:53 AM   #15
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Quote:
Originally Posted by 1991Firebird400
I have made the 305 to 400 swap and oh man was there more to it than i thought. Does anybody know if there is a smaller slave cylinder replacement for a 1991 manual tranny?
Interesting. Swapping a 400 SBC for the 305 is no big deal at all. What was "more to it than you thought", why do you think you need a different slave cylinder and why is this post in someone else's thread?
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