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454bb in 72 blazer which crossmember

Discussion in 'The Garage' started by k2-k5, Apr 12, 2006.

  1. k2-k5

    k2-k5 1/2 ton status

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    Location:
    Vancouver, WA
    I have started the BB swap in my blazer.

    before i get to far I am seriously considering moving the engine forward 2" or so to gain more clearance at the firewall.

    I also would like to be able to remove the oil pan so I am looking at using a '73 and newer crossmember. Has anyone done this?

    How much modification is involved?

    Anyone have a spare crossmember layout around? (In the Portland area)

    any other issues with the swap would be appreciated.

    Cheers.
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    PM burt4x4, i think he used a later crossmember when he swapped in his BBC.
     
  3. Burt4x4

    Burt4x4 3/4 ton status

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    Location:
    California (Modesto area)
    [​IMG]
    Here it is, you can see it is way forward compared to the under the pan on a stock 72 x-member. It is very close to touching the pan 1/8" or less, Never tried droping the pan but it looks doable.
    [​IMG]
    Then I found a crack in the x-member so I got ORDs to replace the 73+ x-member.
    The 73+ is a 3 piece> 1 x-member w/ 2 frame horns(engine mounting serface)
    Here is were I got the idea:
    [​IMG]
    See the top left and center left pics compare the two styles.
    Bottom left shows the engine frame horns or whatever you call um...

    Oh and the ORD x-member is very close to touching also...but it is not..I may make some changes if I feel the need..
    Good Luck
    Burt
     
  4. R77K10

    R77K10 Banned

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    uhmm why would oyu need a later one ?

    bbc were available in truck 68 and up

    same crossmember

    why swap ?

    its the trees you gotta worry about and mounts


    good luck
     
  5. Burt4x4

    Burt4x4 3/4 ton status

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    You don't need a newer style to get the BBC in.
    For me I wanted to use the 73+ so I could drop the pan without lifting the engine out..or up. With firstgen x-member the pan will not come out without lifting the engine off the engine mount/x-member.

    Now that I have gone full circle and installed ORD's stuff I now have to drop the X-member to get the pan off but atleast I don't have to lift the engine (still mounted to the 'frame/engine horns').

    One other benny is your engine mounts are now 73 & Up and you have tons of choices on what to run...
     
  6. '71k204x4454

    '71k204x4454 Registered Member

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    Bbc where not available in 4x4 untill 1973. Yes they where available in the 2wd trucks.

    I'm putting a 1973 and newwer crosmember in mine also. But have not done it yet so don't have any pic's.
     
  7. R77K10

    R77K10 Banned

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    in the 4x4 yes no bb til 73 yep

    i was jut saying trucks in general

    my bad

    68 was the year in general that 396 first came out for trucks


    but 4x4 no

    good luck
     

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