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  1. N

    Compression ratio

    Whats the lowest anyone has got the compression ratio down to? I know the raised wrist pin and shaving pistons drops it some. But has anyone got it down to 17.5 or 17:1?
  2. N

    Keep cracking heads

    Ill know more when i get it apart.
  3. N

    Keep cracking heads

    Well i havent torn it down again yet. But the last 2 times it did this exact same thing. I pulled the heads and found cracks. This is definitely an odd, seldom heard of problem. I already sent another head to the machine shop and will tear it down again this week. I should just order up an...
  4. N

    Keep cracking heads

    Yep. I know they leak because when i start it dead cold the radiator pressurizes instantly. If i have a bleed funnel in place, the bubbles never stop
  5. N

    Keep cracking heads

    Any pics of this? I need a visual. Ill try some googling
  6. N

    Keep cracking heads

    Not running any cooling mod. But ill look into it. I ordered a 4 core aluminum radiator thinking maybe mine is plugged. But i dont think it is. Ill still change it though
  7. N

    Keep cracking heads

    Pump was from classic diesel. Still running stock valve springs. The temp gauge is a vdo mechanical unit. I installed it after i changed the head out the last time and after a few miles heard bubbles in the reservoir when i shut the truck off (damage done). I haven’t towed with it yet.
  8. N

    Keep cracking heads

    Its in the works. Would have happened in the next week or two if the truck would quit breaking it’s self.
  9. N

    Keep cracking heads

    They are different heads that i have bought used, and had rebuild. I have thought about having the cracked ones drilled and pinned. But i don’t know how long it would last. Has anyone tried it between the valves? It does seem to always be on the drivers side. One think i am going to change...
  10. N

    Keep cracking heads

    All the heads ive been through have all gone to the machine shop first for valve job and surface. They inspected them while they are apart. Very meticulous machine shop. I used to work there years ago. Head studs are torqued exactly how arp says to do them. I never have head gasket problems...
  11. N

    Keep cracking heads

    1991 7.3. Has head studs, 110cc pump and a hypermax based turbo kit. Truck makes 20-24 psi. It rips pretty good. The problem im having is that i keep having the heads crack between the valves. Im getting ready to tear it down for the 3rd time in the last year. This last time it only took...
  12. N

    c6 problems?

    I am going to be trading my taurus SHO in on an 89 f250 7.3 4x4 with a banks turbo. it needs a trans. has a c6 now and would like to keep it that way. Do I have to get one out of another 7.3? Also, the trans that is in it, it didn't lose gears and slowly go out, from what i understand it just...

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