Fits Hole Size:3 Inches | Size:3" | Grit Type:120 | Item Length String:13.5 Inches | Shank Diameter:0.310 Inches | Maximum Rotational Speed:800 RPM | Part Number:GBD30012 The Flex-Hone® tool was originally created by Brush Research Manufacturing to deglaze cylinder walls in automotive applications. Brush Research embraced the benefits of a plateau finish and pioneered the concept of plateau honing culminating in the introduction of the Flex-Hone tool in 1972. The Flex-Hone has gained many nicknames over the years and including ball hone, ball style hone, flexihone, dingleberry hone, bead brush, glaze breaker and glaze buster. Flexible honing with the Flex-Hone tool produces an oil holding cross hatch pattern and a true plateau finish free of cut, torn and folded metal. Any type or size of cylinder can benefit from the Flex-Hone®. These abrasive bead style brushes are produced in standard diameters from 4mm to 36 inches. Nine abrasive types are offered including silicon carbide, aluminum oxide, boron carbide and diamond allowing the tool to be tailored to finish any base material. A choice of 11 different grit selections are available for precise control of finish parameters. The elimination of peaks results in rapid ring seating, better oil control, reduced seepage in hydraulic and pneumatic applications and provides better seal performance and longer seal life. Successful applications include firearm chambers, shotgun barrels, musical instruments, combustion chambers, air compressors, pumps, valve bodies, valve guides, brake cylinders, wheel cylinders and the list goes on and on. Flex-Hone® tools are also very effective for deburring cross drilled holes, port radiusing and edge blending. Because of its unique construction, the Flex-Hone is self-centering, self-aligning, and self-compensating for wear so it does not require an elaborate set-up or special training. Deburring can be effectively automated and combined in the machining process to allow a complete cylinder finish in one operation or it can be employed as a secondary operation with equal results.
T**M
4.0" is the right size for a 5.3L Chevy Gen 3 V8
I did some reading prior to rebuilding a 5.3L aluminum block Chevy V8. I got this product through the warehouse at a great price, and found while it was a slightly tight fit for my 3.78" bore, as the next size up it was the proper size for this application. I followed Flex Hone's directions (also used their oil) and it returned a good cross hatch pattern. I can't rate it on longevity since I've only used it one time.
J**B
All the bores came out factory perfect, except #4 which I would give a 8 ...
I have a 2005 Honda CRV that was burning one quart of oil per tank of gas. YES you did read that correctly. Car was abused before I got it, but now I have to fix it. Pulled the engine apart and found scoring on the #4 cylinder wall and a damaged piston. Replaced all 4 pistons, rings, and rod bearings. Took this hone to all the cylinder walls with a little "extra" in #4. All the bores came out factory perfect, except #4 which I would give a 8 out of 10. You could still see some vertical lines but it was 95% better than before. Hondas stance is do not hone, just install rings, and if you can catch a scratch with your fingernail, the block needs replacement. Well I wasn't replacing my block, so this was the next best thing. Put it all back together and the engine runs perfect. Car does not burn a drop of oil and the oil is still golden. It would be black from blowby within 500 miles before. Very pleased! and highly recommended.
C**S
Awesome
Used this hone on my 4.030” 351W and am very pleased with the results. About 30 seconds in each cylinder with a little motor oil Is all I needed. Worked great.
K**L
Works great
I used this to "Bust the glaze" on a 68mm bore, in a cast steel barrel of a motorcycle engine. It worked really well - 10 - 30 SAE Oil, 1,500 RPM for a few minutes, left a very smooth set of honing lines. BUT 1: you have to REALLY take time getting th e abrasive out of the barrel after the hone. and 2) I think you may need to run the devices for longer than I did, as the scoring marks were still evident after running in the Bke.
J**Y
Absolutely better than old school stones; a perfect crosshatch is a click away.
Bought this to rehone the 3.8 Buick cylinders after trying to use them old stone three arm hone devices. I have no idea why I ever thought that contraption would ever work. This thing is a beast. Takes seconds to use properly and I didn't have second thoughts about putting the crank back in and hooking up the Pistons. If you ever plan during your mid-life crisis that you must rebuild an engine, save yourself some time and get this and the next grit under and use these to perfectly hone your sbc or whatever man.
D**S
Best way to hone.
These are the best brushes for honing your cylinder walls. I got nice 45 degree hone marks. It works VERY fast you put your drill on low speed and try to time it so you get the right degree of marks. It leaves a TON of residue so plan on power washing your block with cleaners. 3 to 5 passes is all it takes to clean up the walls. Remember you are removing glazing not boring your cylinder wall.
J**Y
Works great once you get the speed down
Good tool for my VW 1600 rebuild! Took practice on an old detonated cylinder to get cross hatch just right. Practice first and use oil! It'll do the job quick and well.
R**K
good quality hone
pretty much a good quality hone. just the right size to use on a Mopar 318 and 360. done both engines with this honing tool. good results and obviously the tool still looks new.
M**N
GO TO Machine shop,don’t waste time
After everyone’s great reviews I ordered this.....Cheap materialBroken twisted shattered when touched materialQuality control must be on a day off this is garbage.It’s made of man made sand/rock/glass that breaks easily.Shipping took over a month to get it’s headed back on refund before I could even use it.Maybe the smaller models are different but can’t recommend this 104mm model
A**R
Awesome tool!
Never had used one of these before but once I started my budget turbo 5.3L LS project I knew I needed to try one.Very impressed. Used lots of oil and my drill on a medium speed, did 20 up and down motions, stopped, wiped cylinder, re-oiled and repeat x2.Results were great. Perfect size for the OEM 5.3L bore and very nice 45 degree cross hatched pattern.
A**R
Worked like a charm....
It was delivered promptly and worked very well.
Trustpilot
1 month ago
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