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07-17-2019, 04:13 PM
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#1
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Name: RXT
Title: Green Behind the Ears
Status: Not Here
Join Date: Dec 2015
Member`s Gallery
Posts: 38
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5.9 and 6.7 questions
I have a question. A buddy of mine is interested in purchasing a hurt 3rd gen. Apparently the engine has rod knock and he tells me that he would like to install a 6.7 crank in it, if he can get it for cheap. After some discussion on the feasibility of this, and not getting into the 6.7 "Ag" crank, I know that the 6.7 as used in Dodge trucks doesn't have much additional throw than the 5.9 crank which means you won't gain much additional displacement by swapping cranks, and he would have to mill down the 5.9 pistons to clear the head…but this got me to thinking. I know the 6.7 uses larger diameter pistons, so the logical conclusion would be why not just bore out the block to accept the 6.7 pistons? Or is it not that simple? So questions. Is there enough "meat" in the cylinder walls to bore out the .20 something needed for the 6.7 pistons? And, does the 5.9 and 6.7 blocks have the same deck height?? I know it's probably easier to just use a 6.7 block, but it's more of a curiosity thing
Thanks Ed
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07-17-2019, 08:47 PM
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#2
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Name: Poulina
Title: Too Much Time
Status: Not Here
Join Date: Dec 2015
Location: Norcal
Member`s Gallery
Posts: 795
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the blocks have to have a different deck height, because all commonrail rods are interchangeable.
I would recommend using a factory crank, the work involved in using a 6.7 crank far outweigh the benefits.
please discontinue your cousin fuker talk
__________________
2008 QCLB 6.8 48re Suncoast PCS, DDP supermentals, forcedinductions 467/87, Hamilton 188/220, Carrillos, studded mains w/stock girdle
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07-18-2019, 01:08 AM
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#3
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Name: Mark Nixon
Title: No Savior among the flesh
Status: Not Here
Join Date: Feb 2009
Location: Brownville, Nebraska
Member`s Gallery
Posts: 8,676
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JSYK, 6.7 and 5.9 CR blocks both use the same CCL to deck height, it is the piston pin height that differs, along with the stroke.
The ring height is adjusted in there, as well as bowl volume and shape.
Mark.
__________________
If you or I did business like the PEOPLE in government do business, we'd be put in jail. Government is coercive.
Anarchy: The state of existence where there are no masters & no slaves. Therefore, Anarchy means the ABSENCE OF SLAVERY, or, in other words, FREEDOM.
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07-18-2019, 06:41 AM
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#4
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Name: Tobin
Title: 5.7 IDI Powaa!
Status: Not Here
Join Date: Oct 2008
Location: Oviedo, FL
Member`s Gallery
Posts: 1,496
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6.7 block is siamese bore.
__________________
2006 Dodge 2500 QCLB 4x4 Goerend 48RE
1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs
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09-02-2019, 09:35 PM
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#5
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Name: Spinny
Title: Rookie
Status: Not Here
Join Date: Aug 2019
Member`s Gallery
Posts: 4
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Cylinder walls will be extremely thin trying to bore the 5.9 block. 6.7s also have Siamese cylinder walls. Hence the steam holes on a 6.7
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