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Oh, so that's why the P400 is stronger.....

Discussion in 'GM 6.5 Diesel Engines' started by great white, Jun 8, 2010.

  1. great white

    great white Well-Known Member





    Ahhh, now I undestand why the P400 block is supposedly stonger and less suspectable to cracking in the webs. Beefy! :thumbsup:

    Well, metallugy too....

    Just a few pics I ran across while "googling"...
  2. bk95td

    bk95td 6.5 nut job/addict

    Nov 26, 2008
    Thanks for sharing:thumbsup::thumbsup:
  3. Veg_Out

    Veg_Out Walking J Designs

    Aug 20, 2008
    Boise, Idaho
    That thing is bomber! Mine looks like a toy!
  4. JiFaire

    JiFaire Lieutenant Staff Member Lead Moderator

    Feb 10, 2008
    Alberta, Canada
    Wow... that's pretty spanky. Thanks for posting!

    (where did you find them?)
  5. buddy

    buddy Active Member

    Thats that new P400 skirt you always see from the outside. Its just like what CIL6 was trying to make for his engine, a single skirt/main cap piece that went from side to side and all the way out to timing cover.
  6. bison

    bison Well-Known Member

    And that is now exactly what i have in mind for that block in the bottom of my sig,only i plan to put the center 3 outer main cap bolts right in the pan rail.
  7. randomid25

    randomid25 Rattle-Trap Cap'n

    May 6, 2008
    East Tennesee
    Is it possible to buy the bedplate seperately?
  8. Missy Good Wench

    Missy Good Wench Wild Blonde from Cloud Mt

    Nov 19, 2008
    Newberg Oregon
    GEP is not selling even bare blocks as yet.

    The forged cranks are now available from Peninsular diesel though.

    Saw one of these at a local diesel shop last summer. Definately way kewl.
    Light years ahead of the old 6.5 GM blocks for sure.

    Thanks for posting the piccy's

  9. buddy

    buddy Active Member

    That single piece skirt/main cap could make some money if someone has the skills and tools to make things like that and and the custom oil pan to go with it.

    Its one of those thing that even if GM didnt do it, why didnt someone else do it sooner? The Government would have picked up the tab to boot!

    Whats crazy is looking at the connecting rod angles and its no wonder these things clatter and crack main webs
  10. great white

    great white Well-Known Member

    Probably be useless anyways.

    It appears from the pics that the main caps and webs do not have the cap "step" machined into them.

    IOW, you'd never get it to fit the stock 6.5 block.

    Also, if I was a betting man, I'd lay money on the fact that the pan rail is a different thickness and the block around it is redesifned to deal with the added stress. That's jusr a guess though.

    I ran across the pics while googling "P400".

    Oddly enough, it's in a gents dually (94 IIRC) from British Columbia, just across the water and down a bit from where I am.....
  11. bison

    bison Well-Known Member

    Man ,i've been working on that for the last 2 yrs off and on.i need to make an other patern,they could'nt cast the first one i build.
    I tell ye it aint easy.
  12. buddy

    buddy Active Member

    Well Im not saying you aint got the skills, and maybe you even have the tools. But there are companies out there making money off of selling 6.5 diesel parts and engines, with more resources and the business to do such things. It like how is it that we discover new things at all about these engines? Obviously the 6.5 enthusiast crowd did not exist so much until recent years. Or those that did didnt make their mark on the performance side of the house. They dont know as much as you give them credit for, or arent motivated enough.
  13. Matt Bachand

    Matt Bachand Depends on the 6.5

    Jun 10, 2008
    Worcester, MA
    Probably just trying to keep the damn thing from stalling!!!

    There are a few heavy hitters within the last few years who have the know-how and the resources. Combine these with the new 'Performance 6.5' area, which is a TTS Exclusive, and there you go.

    Most of the High performance people probably jumped direct ship to the D-Max and never looked back at the 6.5 :)

    Excellent pictures GW, thanks for sharing.

    Beef is right, I wonder how much heavier it is?
  14. bison

    bison Well-Known Member

    When i started this project when i had that block made without these outer holes, the P400 was'nt even heard of yet,when it did come out i kinda lost heart.
    I kinda like to finnish it someday.
  15. ak diesel driver

    ak diesel driver 6.5 driver

    Feb 7, 2009
    why does it have to be cast why not billet?
  16. schiker

    schiker Well-Known Member

    Nov 9, 2008
    Pendleton, SC
    You would for best performance want it made out of the same exact material to have as close as possible thermal expansion and mechanical properties as the block so it wouldn't change the any bending stress on the block being that big - long and that much material bolted that tightly to the block. Its ok for shorter smaller pieces to be of appreciably different but that big might cause problems.

    Its ok for the heads to be different material but the crank bearings and associated runnout needs to controlled as well as possible.
  17. turbovanman

    turbovanman I has boost, :O)

    May 20, 2008
    Wow, that is a piece of art, :eek: :thumbsup:
  18. great white

    great white Well-Known Member

    Sorry, umm, what? Did you say something?

    I was a bit distracted by your avatar.....):h
  19. bison

    bison Well-Known Member

    X2,my opinion as well.
  20. guybb3

    guybb3 Member

    May 29, 2008
    Tewksbury Mass.
    He said his avatar IS a piece of art!

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