6.9/7.3 question
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Elder User
Joined: Apr 2009
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From: Reno Nevada
6.9/7.3 question
I have hear that the 6.9 and the 7.3 have the same block and you can take a 6.9 and turn it into a 7.3. is this true? If so, what all would need to be done in order to create a 7.3 out of a 6.9?
Senior User
Joined: Sep 2008
Posts: 318
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From: Portage Des Sioux, Mo
Wreckinball, why would you use the 7.3 heads instead of the 6.9. I am thinking about swappin my barely running 89 7.3 out for a 6.9. I can pick up a 94 7.3 turbo motor w/turbo reman with only 80,000 but water in oil very cheap. I would like the heads just for the high temp valves.
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Lead Driver
Joined: Dec 2006
Posts: 6,496
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From: So. Jersey
6.9 and 7.3 cranks are different along with the Harmonic Balancer IIRC. So no the cranks aren't the same. I remember something with the balancing and the balancers can't be swapped.
As far as heads, I'd use the 6.9 heads on a 6.9 block with 7.3 rockers if the 6.9 is 86-older. (87 6.9's came with the updated rockers)
As far as heads, I'd use the 6.9 heads on a 6.9 block with 7.3 rockers if the 6.9 is 86-older. (87 6.9's came with the updated rockers)
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Postmaster
Joined: Apr 2009
Posts: 4,086
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From: Malahat/Cowichan Valley
ouch, that looks silly, yeah the word rockers is missing from there, jeez what a newb! sorry guys. 6.9 block. 6.9 goods, but if you had a solid well maintained block, yeah bore it out. i would love to just build my own spec engine one day haha
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
Crew what they claim is if you use the harmonic balancer from one to the other it is best to use the flywheel too, or vica verca. As far as I know is the cranks are the same and I used a 6.9 flywheel on one of mine without changing the balancer several years before I read this and it still has had no ill affects. You can use the 7.3 rockers and valves with the 6.9 heads, but the heads themselves will not interchange. I would never bore a 6.9 to 7.3 specs or any more than it takes to clean the cylinders up.
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