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head and intake swap

Discussion in 'Street/strip 400/430/455' started by rnoel1969, Nov 3, 2003.

  1. rnoel1969

    rnoel1969 Well-Known Member

    has anyone out there ever tried to put a 71 heads and intake on a 72 or newer motor. i have two 455's and i know that 72 and up have extra cooling ports, but what i wanted to no is if it's been done or will the coolant find a way into my oil pan.
     
    rnoel1969, Nov 3, 2003
    #1
  2. buick535

    buick535 Well-Known Member



    No problem putting earlier heads on a later block. Jim Burek
     
    buick535, Nov 3, 2003
    #2
  3. 69GS400s

    69GS400s ...my own amusement ride!

    Someone with more brain cells left out there than me to help Ron out ??

    " i was wondering if you could swap the 71 heads and intake into the 73. i know that the 73 has extra cooling ports but don't no if the 71 heads and intake would work.when rebuilding the 71 i had bought some used heads that turned out to be 72 when mounted to the 71 block they poured water into the oil pan. the original 71 heads are stage 1 and i'd like to use them if possible"
     
    69GS400s, Nov 4, 2003
    #3
  4. MPRY1

    MPRY1 Gear Banger

    Earlier Blocks cannot accept later heads as an extra water passage was added in 72 I believe. I found that out the hard way with a buddys 67 GS 400. There is no more depressing a sound as when you are filling up the coolant and you hear it pouring into the valley. :ball:
    Late blocks can take any head from 67 up.
     
    MPRY1, Nov 4, 2003
    #4
  5. buick535

    buick535 Well-Known Member




    Yes, no problem with the 71 heads and intake on the 73 block. You can use later heads on an earlier block, but you must plug the extra water hole in the head to prevent water going into the lifter valley. Been doing this for 15 years. Jim Burek
    P.A.E. ENTERPRISES
    www.paeenterprises.com
     
    buick535, Nov 4, 2003
    #5
  6. MPRY1

    MPRY1 Gear Banger

    Jim what do you use to plug the extra hole? I sure wish I'd known about that 15 years ago when we were doing the 67..:ball:
     
    MPRY1, Nov 4, 2003
    #6
  7. buick535

    buick535 Well-Known Member



    There are 2 ways to do it, you can thread the hole and scre in a pipe plug or use a 3/4 inch freeze plug. With the freeze plug, I use epoxy around it as a sealer just to make sure there are no leaks. Jim Burek
     
    buick535, Nov 5, 2003
    #7

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