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Rockers Arms & Rocker Shaft Kit (12 Arms & Shaft Honed to .002" clearance)

$379.99
Part #
839-128
Application
TR250/6, GT6
In Stock In Stock

The stock rocker arms were never bushed, and the tolerances specified are based to the cast iron on steel interface. This translates to a clearance of 0.0028" to 0.0033". If your rockers are worn, both the rockers and the rocker shaft must be replaced. If the bore diameter in the new rocker is on the high side, and your rocker shaft is on the small side of the tolerance, the clearance will be close to the maximum allowed. In addition, the stock components will wear more quickly than rocker arms fitted with bushings.

We have gone out and arranged for bushed rocker arms to be made for us by a specialty supplier in England. The rockers are identical to the OE rocker in shape, but they are sized for and fitted with a bronze bushing. They must be matched to a specific rocker shaft by honing the bushings. We suggest a rocker arm bushing-to-shaft clearance of 0.002".

The advantages are numerous. With bushings honed to fit, the rocker arms and the rocker shaft will last longer. With the tighter tolerances, you will not lose as much oil pressure as you would with the stock un-bushed rocker arms. The other critical area for wear is the tip, which comes in contact with the valve stem. The tips are very hard, 50-52HRC (Rockwell C scale), which is the same as new unused rocker arms. Moss also offers matched sets of rocker arms and rocker shafts, with the bushings already honed to give a clearance of 0.002".

Installation

Instructions

Documents

Instructions

The Longest in the Business

  • All Classic British products are warrantied to be free from defects in material and workmanship for 2 years from the date of invoice.
  • All superchargers, supercharger components, and supercharger hardware are warranted to be free from defects in material and workmanship for 1 year from date of invoice.
  • Moss Motors, Ltd. will, at its discretion, repair or replace any part that fails in service within the warranty period. This warranty does not cover labor, failure of related components, normal wear of brake or clutch components or failure resulting from alteration, misuse, accidental damage, faulty installation, or faulty repair.
  • Warranty requests should be submitted to our sales department and must be supported by the original Moss Motors purchase invoice and documentation of the failure.
Product Name: Rockers Arms & Rocker Shaft Kit (12 Arms & Shaft Honed to .002" clearance) Make: Triumph Model: TR250, TR6 Year: 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976