piston ring set
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Junior User
Joined: Mar 2005
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piston ring set
hi I'm in the process of rebuilding the 7.3 i'm planning to use the banks turbo kit, i want to keep everything original in the engine same pistons standard just a new set of rings, what brand would you recommend for this project? thanks
Postmaster
Joined: Dec 2011
Posts: 3,860
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You want to make sure to get file-fit rings, so you can make a tight ring gap - perhaps .005-.010 thou. Not the .060 or so that was stock.
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Postmaster
Joined: Aug 2010
Posts: 2,554
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From: Northern Arizona
I don't think you can find file fit 7.3 rings. Justin had to order some .060" oversize 390 engine rings and used the second ring out of that set to file fit his standard bore 7.3. But if you were going to spend money on a set of 390 oversize rings, might as well just order the total seals from R&D now that he stocks them.
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Postmaster
Joined: Aug 2010
Posts: 2,554
Likes: 7
From: Northern Arizona
Justin ended up at .034" at the top of the bore, but that was with .004" bore taper and he checked for binding on the piston. The whole thing is discussed here:
https://www.ford-trucks.com/forums/1...i-build-6.html
https://www.ford-trucks.com/forums/1...i-build-6.html
Senior User
Joined: Aug 2015
Posts: 100
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From: michigan
i bought a set of mahle rings part # 41548.020 .they are .020 over .the paper said end gap is .004 per 1" of bore diameter minimum. that comes to .016 . mine were at .018 so i just used them as they are. they must be file fit rings . try part # 41548 and your bore size .
