Unleaded Kit-Cylinder Head

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  • MG Magnette Mk 3
  • MG Magnette Mk 4
  • Riley 4/68
  • Riley 4/72

To convert your cylinder head:

  1. Strip old cylinder head, check for cracks and then clean in caustic soda.
  2. After washing off the caustic solution in a hot wash tank, dry the head and grit blasted to remove any remaining carbon and to clean the waterways.
  3. Fit the Manganese silicon bronze valve guides and ream to size. (Bronze removes heat two and a half times faster than original cast iron valve guides.
  4. Fit the Lead free exhaust seats inserts.
  5. Cut the valve seats using three angles, (30, 45 and 60 degree). This aids the flow and increases B.H.P. by approx 7% with premium lead-free fuel.
  6. Blend the throat valves to remove any sharp edges caused by fitting the inserts and cutting the seats.
  7. Skim Head if required.
  8. After de-burring, hot wash the head, dry , assemble and paint.

This procedure is best left to a qualified engineer/machinist and these instructions are offered as a guideline only!

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