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454 in a First Gen

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by pornorob, May 31, 2003.

  1. pornorob

    pornorob 1/2 ton status

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    anyone here put a 454 in their k5? what was involved in the swap? I've got a 350 in it now and a th350. any input would be great /forums/images/graemlins/ears.gif
     
  2. mosesburb

    mosesburb For Rent Premium Member GMOTM Winner

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    I put a Gen V in a '72 Suburban. It fits, but not without a bit-o-work. Don't do it if you're planning on using mechanical clutch linkage. If you're running a big-cap HEI, you will ned to massage the firewall with a hammer (not a whole bunch) to gain clearance for the cap. You will need to cave-in the firewall by where the clutch linkage exit hole is (hence, don't plan on using mechanical linkage). The opposite side of the "engine cove" will need to be caved-in as well (same as the clutch hole but on the passenger side). These two areas get caved in a fair bit--don't worry about doing too much, because if you do too much, you can easily un-cave it from the inside, but on the same note, you don't want to do too little, because once the motor is in, it is a ROYAL beeatch to cave the sheetmetal with a big-ass motor in the way. That is about the most of the firewall mods necessary to fit. If you have the six-quart oil pan on your motor, you will need to remove a chunk of the pan, just forward of the sump, because it will contact the crossmember--'73 & up didn't have this problem because their engine x-member had a forward kickout in it, giving the pan plenty of clearance. There is a pan available through GM Performance Parts that is a five quart unit that MAY work for you without mods (I found the pan, but was too friggin' cheap to buy it, but I had access to a welder, so I modified my pan). That is about the worst of the modifications you will need to do to fit the motor into your ride. FYI, I found out the hard way that the early chevy 4X4 frames like to bend upward from the body mount under the cowl forward. I didn't realize how bent mine was (from normal use, not from an accident), and when I got it straightened, alot of my clearance issues either went away or became much less of a problem, so you may want to find a reputable frame shop that knows the older trucks and have it checked/straightened before you start to alleviate some of the problems I encountered. That is about all I can recollect at the moment, if something comes back to me I will post it back here. Have fun with your project there, and let me know if I can be of any further assistance /forums/images/graemlins/grin.gif.
    Good Luck!
    Nick
     
  3. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    I wouldn't mind seeing pics of that '72 Burban and BBC.....

    (for obvious reasons!) /forums/images/graemlins/wink.gif
     
  4. mosesburb

    mosesburb For Rent Premium Member GMOTM Winner

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    Hey Greg,
    I do have pictures, but not in computer form /forums/images/graemlins/frown.gif. The motor has already been removed in preparation of the Cummins install. I have "old-tech" photos that I may be able to have someone scan for me. I will try to get some to you when I get a chance. It did look real good when it was done (seriously).
     

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