Engine Kits

Cylinder Flex Hone

Brush Research Mfg. Co. has a flex-hone for any type and size of cylinder
The Flex-Hone® Process (Super finishing) produces a controlled surface condition unobtainable by any other method. It involves finish, geometry and metallurgical structure and a high percentage plateau free of cut, torn and folded metal (with radiused ports).

Their cylinder flex hone is a resilient, flexible, honing tool with a soft cutting action. The abrasive (points) globules each have independent suspension that assures the Flex-Hone® to be self-centering, self-aligning to the bore, and self-compensating for wear.

If Your Cylinder Flex Hone Specifications Call For:

  • Developing a surface plateau of over 60%
  • Producing an oil holding cross-hatch pattern
  • Reducing Ra, Rpk and Rvk values
  • Increased bearing area

If You Want Benefits Of:

  • Lowered oil consumption
  • Less blow-by
  • Less friction
  • Improved sealing surface

 

Then Flex-Hone® it!

 

Bore
Size

Heavy Duty
120 Grit
STD Rings

Heavy Duty
240 Grit
Moly Rings

Heavy Duty
320 Grit
Moly Rings

Cylinder
Washing
Brush

2-3/4" to 3"
76mm

Flex Hone
GBD30012

Flex Hone
GBD30024

Flex Hone
GBD30032

10A312

3" to 3-1/4
83mm

Flex Hone
GBD31412

Flex Hone
GBD31424

Flex Hone
GBD31432

10A312

3 1/4" to 3-1/2
89mm

Flex Hone
GBD31212

Flex Hone
GBD31224

Flex Hone
GBD31232

10A312

3-1/2" to 3-3/4"
95mm

Flex Hone
GBD33412

Flex Hone
GBD33424

Flex Hone
GBD33432

10A4

3-3/4" to 4"
101mm

Flex Hone
GBD40012

Flex Hone
GBD40024

Flex Hone
GBD40032

10A4

4" to 4-1/4"
108mm

Flex Hone
GBD41412

Flex Hone
GBD41424

Flex Hone
GBD41432

10A412

4-1/4" to 4-1/2"
114mm

Flex Hone
GBD41212

Flex Hone
GBD41224

Flex Hone
GBD41232

10A412


Standard Hone

 

Cylinder Flex Hone | Northern Auto Parts
Heavy Duty Hone

Bore
Size

STD Hone
120 Grit
STD Rings

STD Hone
240 Grit
Moly Rings

STD Hone
320 Grit
Moly Rings

Cylinder
Washing
Brush

3" to 3-1/4
83mm

Flex Hone
GB31412

Flex Hone
GB31424

Flex Hone
GB31432

10A312

3 1/4" to 3-1/2
89mm

Flex Hone
GB31212

Flex Hone
GB31224

Flex Hone
GB31232

10A312

3-1/2" to 3-3/4"
95mm

Flex Hone
GB33412

Flex Hone
GB33424

Flex Hone
GB33432

10A4

4" to 4-1/8"
105mm

Flex Hone
GB41812

Flex Hone
GB41824

Flex Hone
GB41832

10A412

4-1/2" to 4-5/8"
118mm

Flex Hone
GB45812

Flex Hone
GB45824

Flex Hone
GB45832

10A5

 

The sample Bore listings below are listed to only to the ten thousandths (0.01) which is all that is needed to find the correct cylinder flex hone. If your engine is not listed below and you do not know your bore size, please call (1-800-831-0884) or email us with your year, make, motor size and V.I.N. code, and we will find the correct cylinder flex hone for you.

 

 

Ford 3.0L 300 302 5.4L 330 351 352 360 390 400 6.9L* 428 429 7.3L* 460
Bore 3.50 4" 4" 3.55 3.87 4" 4" 4.05 4.05 4" 4" 4.13 4.36 4.11 4.36
Chevrolet 2.2L 2.8L 3.1L 3.2L 3.4L 250 283 302 305 307 327 350 396 400 454
Bore 3.50 3.50 3.50 3.56 3.62 3.87 3.87 4" 4" 3.87 4" 4" 4.09 4.12 4.25
 

International

This is a low-temperature abrading process that exposes the undisturbed base metal structure to produce a long-wearing surface. It is a method of developing a surface on a metal part that is optically smooth and metallurgically free of any fragmented, amorphous or smeared metal from previous operations. It is accomplished at a low pressure where the “stones” float.

See and read the various booklets of actual tests covering almost every situation that will ensure a superior performance in situations depending on surface finish.

The particular type of Flex-Hone® crosshatch is extremely efficient in providing a multiplicity of oil grooves or valleys for oil retention as opposed to the often unidirectional or uneven valleys common to the conventional type of rigid flex hone. A crosshatch usually remains as the cylinder wall has been wear-reduced by the FlexHone®

 

 

This picture is of a rigid honed by fa actory rework section. Photo at 1000x. The cross-hatch has the majority of the cut in one direction and is smeared, torn, jagged and folded metal on the surface. Some smeared metal is loosely attached to the surface. This is a very peaky profile of finish. 40 to 50u” (1.02 to 1.27um) finish. Cylinder #B-1

This photo is an after of the Flex-Hone.® 120 grit silicon carbide, photo at 1000x. It has an uniform cross-hatch pattern and a clean open appearance with smeared, folded and torn metal removed. This is an excellent semi-plateaued profile. There are small dust particles visible on the surface in  the “Y” photo. 20 to 25U” (.51 to .63 um) finish. Cylinder #B-1



This product is in the following categories:

HomeToolsSpecialty ToolsDrivetrainBrake Service
HomeToolsSpecialty ToolsEngineOther Engine Building
HomeToolsSpecialty ToolsEngineCylinder

Manufacturer:

BRM

Part #: FHP

Flex-HoneĀ® Oil: 1/2 pint
Price: $14.99
Quantity:

Part #: GB31212

3-1/2" 89mm 120SC (Grit) Standard duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $49.10
Quantity:

Part #: GB31224

3-1/4" to 3-1/2" 83mm, 240 Grit, Standard Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $52.06
Quantity:

Part #: GB31232

3-1/4" to 3-1/2" 83mm, 320 Grit, Standard Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $73.72
Quantity:

Part #: GB31412

3-1/4", 83mm 120SC (Grit) Standard duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $46.08
Quantity:

Part #: GB31424

3" to 3-1/4" 83mm, 240 Grit, Standard Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $48.88
Quantity:

Part #: GB31432

3" to 3-1/4" 83mm, 320 Grit, Standard Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $69.12
Quantity:

Part #: GB33412

3-3/4", 95mm, 120SC, (Grit) Standard duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $52.88
Quantity:

Part #: GB33424

3-1/2" to 3-3/4" 95mm, 240 Grit, Standard Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $56.06
Quantity:

Part #: GB33432

3-1/2" to 3-3/4" 95mm, 320 Grit, Standard Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $79.34
Quantity:

Part #: GB41812

4-1/8", 105mm, 120SC, (Grit) Standard duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $56.26
Quantity:

Part #: GB41824

4-1/8", 105mm, 240SC, (Grit) Standard duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $59.64
Quantity:

Part #: GB41832

4-1/8", 105mm, 320SC, (Grit) Standard duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $84.42
Quantity:

Part #: GB45812

4-5/8", 118mm, 120SC, (Grit) Standard duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $62.70
Quantity:

Part #: GB45824

4-1/2" to 4-5/8" 118mm, 240 Grit, Standard Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $66.44
Quantity:

Part #: GB45832

4-1/2" to 4-5/8" 118mm, 320 Grit, Standard Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $94.06
Quantity:

Part #: GBD30012

2-3/4" to 3", 76mm, 120SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $66.82
Quantity:

Part #: GBD30024

2-3/4" to 3", 76mm, 240SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $70.84
Quantity:

Part #: GBD30032

2-3/4" to 3", 76mm, 320SC, (Grit) Heavy Duty Flex-Hone for Block Cylinders (13 1/2"OAL)
Price: $100.24
Quantity:

Part #: GBD31212

3 1/4" to 3-1/2, 89mm, 120SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $71.02
Quantity:

Part #: GBD31224

3 1/4" to 3-1/2, 89mm, 240SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $75.28
Quantity:

Part #: GBD31232

3 1/4" to 3-1/2, 89mm, 320SC, (Grit) Heavy Duty Flex-Hone for Block Cylinders (13 1/2"OAL)
Price: $106.52
Quantity:

Part #: GBD31412

3" to 3-1/4, 83mm, 120SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $68.96
Quantity:

Part #: GBD31424

3" to 3-1/4, 83mm, 240SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $73.10
Quantity:

Part #: GBD31432

3" to 3-1/4, 83mm, 320SC, (Grit) Heavy Duty Flex-Hone for Block Cylinders (13 1/2"OAL)
Price: $103.40
Quantity:

Part #: GBD33412

3-1/2" to 3-3/4", 95mm, 120SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $76.14
Quantity:

Part #: GBD33424

3-1/2" to 3-3/4", 95mm, 240SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $80.72
Quantity:

Part #: GBD33432

3-1/2" to 3-3/4", 95mm, 320SC (Grit), Heavy Duty Flex-Hone for Block Cylinders (13 1/2"OAL)
Price: $114.20
Quantity:

Part #: GBD40012

3-3/4" to 4", 101mm, 120SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $81.26
Quantity:

Part #: GBD40024

3-3/4" to 4", 101mm, 240SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $86.14
Quantity:

Part #: GBD40032

3-3/4" to 4", 101mm, 320SC, (Grit) Heavy Duty Flex-Hone for Block Cylinders (13 1/2"OAL)
Price: $121.84
Quantity:

Part #: GBD41212

4-1/4" to 4-1/2", 114mm, 120SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $92.44
Quantity:

Part #: GBD41224

4-1/4" to 4-1/2", 114mm, 240SC, Heavy Duty Flex-Hone for Block Cylinders (13 1/2"OAL)
Price: $97.98
Quantity:

Part #: GBD41232

4-1/4" to 4-1/2", 114mm, 320SC (Grit), Heavy Duty Flex-Hone for Block Cylinders (13 1/2"OAL)
Price: $138.64
Quantity:

Part #: GBD41412

4" to 4-1/4", 108mm, 120SC, Heavy Duty Flex-Hones for Block Cylinders (13 1/2"OAL)
Price: $86.82
Quantity:

Part #: GBD41424

Fits Bore Sizes 4" to 4-1/4" 240 Grit
Price: $92.04
Quantity:

Part #: GBD41432

4" to 4-1/4", 108mm, 320SC, (Grit) Heavy Duty Flex-Hone for Block Cylinders (13 1/2"OAL)
Price: $129.66
Quantity: