400 piston on a 426 rod?


5 replies to this topic
  • carljohnson13

Posted March 26, 2008 - 06:09 AM

#1

Will a 400 top end work on a 426 bottom with 426 rod? The circlip came off of the oil pump drive gear while WFO allowing it to make contact with brads on the back of the clutch basket, causing it to become a UFO and cracking the case where its shaft used to be. May have found a 426 bottom end and was wondering if it would work as I have maybe 6hrs on a fresh topend.
And yes, naturaly all of this happened about 18 miles from the truck.
Thanks for any help
CJ

  • SXP

Posted March 26, 2008 - 06:34 AM

#2

Will a 400 top end work on a 426 bottom with 426 rod? The circlip came off of the oil pump drive gear while WFO allowing it to make contact with brads on the back of the clutch basket, causing it to become a UFO and cracking the case where its shaft used to be. May have found a 426 bottom end and was wondering if it would work as I have maybe 6hrs on a fresh topend.
And yes, naturaly all of this happened about 18 miles from the truck.
Thanks for any help
CJ


No. The 426 con-rod small end is bigger (than the 400) to accomodate the larger 426 piston pin (19 mm IIRC). The 400 piston has a smaller (17 mm or 18 mm - can't remember) pin.

  • carljohnson13

Posted March 26, 2008 - 07:09 AM

#3

Thanks for the info. I guess I could swap the crank as well.

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  • carljohnson13

Posted March 26, 2008 - 07:11 AM

#4

"SXP" On a side note, has your 2 wr 400's given good service?

  • ncampion

Posted March 26, 2008 - 07:23 AM

#5

Swapping the crank won't work, have to swap the rod. Might also consider having the 400 cylinder bored to 426, using a 426 pistion and now you have a total 426!

  • carljohnson13

Posted March 26, 2008 - 07:53 AM

#6

Obviously my lucky #13 number plate has caught up with me. I thought the 400 crank would work in the 426, back to the drawing board.




 
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