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Nov 6, 2004 | 07:48 PM

furz4

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flex hone

I am rebuilding a 351 for my 92 f250. I am using molley rings and am wondering what flex hone grit I should use. I have allways used 120 or 180 with cast rings in the past and they allways seated instantly and gave good life. I am thinking I should probably use 320 for a finer finish to match the ring type. ANybody have any recomendations for this.

Nov 7, 2004 | 09:14 AM

Pam's Red

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From: Front Range of Colorado

I used to use 180, but have been shipping the blocks off to a performance machine shop and can't remember what he used. He retired early this year and went travelingl so I can't call him up.
Pam

Nov 10, 2004 | 11:45 AM

90f150moneypit

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From: Still under the hood in O

Paste from Hastings website:

CYLINDER ROUGHNESS
Substantial controversy exists on the correct cylinder roughness for proper seating of piston rings, whether chrome, moly, or plain cast iron. It has been our experience that the use of 220-280 grit stones and achieving proper cross hatch angle produces a finish compatible to all three types of the above rings.

Nov 10, 2004 | 02:06 PM

furz4

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So you would go with a 240 grit flex hone then? I was thinking 180-120 cast and 320 molly or chrome. Seems that finish with flex hone is smoother then the same grit with rigid stones.

Nov 10, 2004 | 02:06 PM

furz4

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So you would go with a 240 grit flex hone then? I was thinking 180-120 cast and 320 molly or chrome. Seems that finish with flex hone is smoother then the same grit with rigid stones.

Nov 10, 2004 | 03:00 PM

90f150moneypit

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From: Still under the hood in O

Yes, I use the 240 for all of my rering jobs regardless of ring material.

Just make sure to keep that drill moving, never in one place and use plenty of tranny fluid.

Nov 10, 2004 | 07:44 PM

furz4

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Well I just checked and my old hone was a 120. It did many a motor and did an excellent job for prep for cast rings allways instant seating with no smoke or excessive oil consumption. Ordered a 240 tonite. As flex hones give a smoother finish then regular hones I think your right on with your recomendation. To smooth a finish can cause problems and your rings may never seat. And one has to beleve hastings knows what they are talking about also..