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sbc to bbc conversion.. what is needed

Discussion in 'The Garage' started by RootBreaker, Oct 18, 2005.

  1. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    ok so hopefully this weekend I will be driving the 1987 1 ton home.. with a 454... well the truck has a turbo400 and I wanna keep my smc465....
    what is the difference other than dropping in the motor, wiring and what else is needed for the clutch to work correctly... different flywheel? clutch pressure plate? bellhousing?

    thanks
    Jeff
     
  2. jays68yak

    jays68yak 1/2 ton status

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    not sure about the tranny and what not. But I just dropped a 454 in my 79 blazer, bolted right up.
     
  3. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    what cha got in yer blazer???

    I am getting this truck which is a automatic and dropping it into a manual
     
  4. bajaviking

    bajaviking 1/2 ton status

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    One thing to look out for is the flywheel, I think depending on the year some 454's are balanced externally and others internally and you need to get the correct flywheel, if not you will have bad vibrations. I am sure some of the engine gurus here can help you more.
     
  5. jays68yak

    jays68yak 1/2 ton status

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    454/th400/208
    the 208 wont be in too long, most likly cuz it will blow up. :D
     
  6. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    I got a th400/np205 fer ya... :wink1:
    or sm465/np205 :haha:
     
  7. dodgedude99

    dodgedude99 1/2 ton status

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    i just had to get a flywheel for a 454, but i went the GMPP 454 HO route.
     
  8. diesel4me

    diesel4me 1 ton status Premium Member

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    Off the top of my head....

    You'll need the motor (duh! :p: ),and a manual tranny flywheel for the year of the 454..all the pre 85 454's used an externally balanced one,I don't know about newer ones..you'll need a larger radiator(rob the one from the donor truck if possible,and all the related shroud,hold down brackets,etc.) --also need new radiator hoses (small block ones wont fit),and if the 454 has no P/S bracket or pump,you will need to buy one--small block brackets are different(and so are the pulleys)..

    You'll need to modify the exhaust to fit the small block system(I dunno if U have headers or not)..and the usual hundred other small dewhickeys that prove to be different,like maybe the throttle cable having a different end on it,etc...if you think you can do it over a weekend,good luck--I have installed a motor and got it running that quickly before,but I always run into one part I can't get on a sunday,and ended up using alternate transpotation,or calling in sick on monday,so I could finish the job..A few times I stayed out till wednesday,to let my back recover!.. :doah: :crazy:
     
  9. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    thanks for the tid bits... also i got a plus to this.. not my dd... hence can take longer!!!! :haha:
     
  10. jays68yak

    jays68yak 1/2 ton status

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    I have 2 241s in my garage. Between the 3 I should have a few trips. Then maybe Ill start saving for a doubler. :D


    but pm me a price for the 400 to 205 adapter. I might want to buy that to start my stash.
     
  11. thor

    thor 1/2 ton status

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    You need a flywheel, All 454s are externally balanced, 91 and newer are one piece seal motors and have a smaller bolt pattern. Use the motor mounts off your small block, then all the accesories off the donor truck.
     

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