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engine mounts location: 350 to 250 ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by R72K5, Feb 19, 2003.

  1. R72K5

    R72K5 Banned

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    can anyone tell me if the location of engine mounts on 350 blocks are in same place as on 250 blocks- distance from there back to bellhousing flange ? IE: will 250 go in place of 350 without having to move tranny ? i take it engine block brackets differ between the two? 73-up*

    thanks
     
  2. the professor

    the professor 1/2 ton status

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    the short answer is no..
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    the 250 sits back into the depression in the firewall.very close...

    the V8 sits up further to clear the heads and the distributor
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    the crossmember should go into provided holes in the frame, but you will need a shorter front drive shaft..
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    and I think there are holes for the motor mounts too
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    haven't replaced a V8 with a I6, but I have done it the other way...
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    You "can" put SB in place of a 6 on the same mounts, but it is close, and the valve covers are tough to get off..
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    A BB forget it...need to hammer the firewall
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    /forums/images/graemlins/cool.gif
     
  3. R72K5

    R72K5 Banned

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    this is on a 2wd, forgot to add that, i should have posted on 2wd board, dang, :S

    i thought i had previously measured mounts to bellhousing distance between a six and a v8 and came up with pretty much same measurement, but cant remember now, which is why im trying to find out now,

    thanks
     
  4. the professor

    the professor 1/2 ton status

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    Yea, the mount to bellhousing is the same..on all..that is the problem..the 6 is longer, and has nothing on the back of it..
    ==
    That is the soul purpose of the indentation in the firewall, to clear the 6cyl engine
    ==
    with the 6, the back of the head is where the V8 distributo is..with the bellhousing flange, sticking under the cabl

    with the 8. the distributor and V heads, prevent the motor from sitting that far back, so the bell housing mountin flange is in front of the firewall
    ==
    Thats why you have to move the mounts back to move the engine back...
    ==
    You may also,not clear the radiator with the engine on the V8 mounts...measure from the motor mounts to the radiator
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    I believe the actual setback is about 4 inches..
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  5. R72K5

    R72K5 Banned

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    so, engine mounts move at frame rails and tranny stays put ?
    i hope so,


    thanks
     
  6. the professor

    the professor 1/2 ton status

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    No,no..I was not clear...the frame mount move back, and the trans moves back...
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  7. R72K5

    R72K5 Banned

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    [ QUOTE ]
    No,no..I was not clear...the frame mount move back, and the trans moves back...
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    [/ QUOTE ]

    crappy,
    thanks
     

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