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HELP Engine swap???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by madups311, Jan 7, 2002.

  1. madups311

    madups311 Registered Member

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    Hey, I am so close to purchasing a new engine and I have Questions!!! I currently have a 350 and I found a 400 putting out over 425horses has anybody done this swap??? I was wondering was else I would need to do as well, to make this swap complete??? Please give me your input.

    1979 Jimmy 4" skyjacker, add-a-leaf, 35" M/T's, Body Lift purchased.
    2001 Pathfinder LE Mile Marker Winch
     
  2. Neil

    Neil 1/2 ton status

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    should be a straight up deal.....

    Neil H. Alabama.. "It's a full size thang, Jeep owners don't understand!!" '78 K5 400ci 4x4 AT,AC,PW Cheyenne., '74 C10 4x2
     
  3. JIM88K5

    JIM88K5 1/2 ton status

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    You'll need a 400 balancer & a 400 flexplate.-Jim

    88 Silverado K5 5.7-700R-208-10 bolts-4.56-35in
    Procomp AT's- some ORD stuff & a CV driveshaft
     
  4. 95 Silverado

    95 Silverado 1/2 ton status

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    the 400 small-block requires a special externally balanced flywheel or flex plate, the one on your 350 won't work. other than that the other external small block parts all interchange. be sure it is a small block, the later 396 & 402 big blocks were called 400's, they could be used also, but would require more changes.

    '95 Chevy Silverado 1500
    5.7 V8-NV4500- 3.73 rears
    See My Toys: <a target="_blank" href=http://community.webshots.com/user/wdb172454>http://community.webshots.com/user/wdb172454</a>
     
  5. madups311

    madups311 Registered Member

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    As I was just made aware it is 413ci, will this make a difference?

    1979 Jimmy 4" skyjacker, add-a-leaf, 35" M/T's, Body Lift purchased.
    2001 Pathfinder LE Mile Marker Winch
     
  6. Sparky87k5

    Sparky87k5 1/2 ton status

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    But is it a big block 396/402 or a small block 400 bored out to 413. Boring .060 to 413 makes the cylinder wall pretty thin in a small block 400. A small block 400 putting out 425 hp might be real strong if the torque is also in that range. Be sure and check cam specs, compression and valve size. Too many 400's I've seen made all their power above 4000 and had poor low end torque due to cam, heads and compression choice.

    87 K5, 427BBC,D60 &amp; 14BFF, NV4500, NP208, TSM disc's,
     
  7. Neil

    Neil 1/2 ton status

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    Is this motor in a drag car? Temperature at .060 with a 400 block is not as much concern to crank it up, run it hard then shut it down. Running it up and down the road and at traffic lights will not be as friendly to a thin wall siamese cylinder motor like a 400. If it is a running motor, the balancer and flexplate is on it right? duh.
    If all is well and the motor can withstand use and abuse, take the 350 loose from the transmission and motor mounts, label all of your wiring, and swap em. It's not real hard to do. I have done many small block swaps and the 400 fits right where a 350 sat. The dimensions of the balancer and flexplate on a 400 are truly different than a 350. The 350 can also be made into 421 cubic inches, as I know a guy with a 421ci LT1, so research what this motor is made of.

    Neil H. Alabama.. "It's a full size thang, Jeep owners don't understand!!" '78 K5 400ci 4x4 AT,AC,PW Cheyenne., '74 C10 4x2
     

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