Unleaded conversion on our 1962 TVR Grantura

We have now carried out the unleaded conversion on our 1962 TVR Grantura.

To carry out an unleaded conversion first we have stripped the cylinder head and checked for any imperfections wear. The existing seat have been bored out to remove.

Our new inserts (above) have been fitted into the original seat with a 6 thou interference. A very thin layer of oil has been applied before a three angle profile is machined into the valve seat.  The new seat is checked for concentrically and is ready for the valve to be fitted.