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Honing Plates & Cylinder Head Plates (Torque Plates)

Introduction To BHJ Honing Plates (Torque Plates) & Options
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BHJ Honing Plate CH-3-R for Big Block Chevy

BHJ manufactures Honing Plates (Torque Plates) to fit more than 400 engine applications in all sizes, from single-cylinder to V-12s and is recognized worldwide as the authority in Honing Plate development and production today. Since the conception of the initial Honing Plate designs that were introduced by BHJ Products in early 1975, continued research and development has brought numerous design improvements that bring us to the models available today.

Click here for a current list of Honing Plate engine applications.

BHJ R Model Honing Torque Plate In UseHead-bolt torque can dramatically distort cylinders and cylinders can not be bored or honed accurately if cylinder dimensions change so significantly after assembly. Rings won't seal well and scuffing is likely to occur if the engine overheats. Use of BHJ Honing Plates rectifies all of these problems, leading to more consistent tolerances, better sealing and more power.

Honing Plate Standard Features:

  • 1-3/4" thick Meehanite Cast Iron or Aluminum Tooling Plate give maximum rigidity and resistance to permanent distortion and most closely simulate the stresses induced on the cylinder wall by the cylinder head when it is torqued in place. In addition, these materials have essentially the same coefficient of expansion as cylinder heads, important to those honing at operating temperature.
  • Cast Iron Plates are Blanchard Ground on both sides flat and parallel within precision commercial tolerances.
  • Aluminum R Model Plates are supplied with heat-treated Steel Inserts (T-Washers) in all bolt holes standard.
  • Plates are manufactured with .090"-.095" larger bore size than the largest standard engine bore diameter found in the applicable engine family in most applications, allowing the Plate to accommodate .060" over-bore. This maintains full gasket firing ring compression, thus further enhancing bore distortion. Special bore diameters are available upon request.
  • Head-bolt holes are precision machined to factory tolerances and special bolt hole sizes are also available.
  • Clearance holes for locating dowels are machined over-size to allow visual alignment before torquing.
  • Indexed or "Dialed In" dowel holes are also available upon request. (View DID description in Options section below.)
  • All Honing Plates are shipped in a durable, protective Wooden Case.

BHJ Honing Torque Plate In UseClick here for a current list of Honing Plate engine applications.

Honing Plate Options

The following Options can be ordered with virtually any BHJ Honing Plate:

Special Bore Diameters: Part number suffix - S
Standard bore diameter for most Honing Plates is .090"-.095" over the largest standard engine bore diameter found in the specific engine family. Any special diameter may be machined in the Plate (may void warranty in some extreme big-bore applications).

Heat-Treated Inserts Installed: Part number suffix - T
Heat-treated Steel Inserts (T-washers) can be installed in the top surface of the Plate for each head bolt hole, resulting in increased durability and longevity. Included as standard equipment in aluminum and Production Model plates, Inserts are also beneficial in cast iron R and CB Model plates.

Threaded Steel Inserts: Part number suffix - TI
Threaded Steel Inserts (helicoils) are available for added durability in aluminum or cast iron Plates with threaded holes.

Heat Treated Spacers: Part number suffix - HT
D.O.M. Steel Spacers, as supplied with most R Model plates, may be heat-treated for increased durability.

O-Ring and Receiver Grooves: Part number suffix - O
O-Ring or receiver grooves are available in the deck surface of the Honing Plate, to more closely simulate the bore distortion induced by a cylinder head with similar machining. Customer must supply O-Ring groove outside diameter, width and depth when ordering.

Dialed In Dowels: Part number suffix - DID
All standard Honing Plates are machined with oversized locator dowel-pin holes to allow for Honing Plate bore alignment over the typically misaligned bores of any given factory block. The Dialed In Dowel option includes dowel pin locator holes which are on-size to the dowel pin and in the exact relationship to the bores, as per the factory specifications. This option allows the plate to be used for bore layout during the boring operation. It is important to realize that bores located in this manner will only be as correct as the dowel pin location they are referenced from in any given block.

Current Honing Plate engine applications

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