Inlet Valves

The early Series 1 models were fitted with a low compression (6.6:1) cylinder head (UE2299).
Continental models were fitted with a 7.25:1 compression cylinder head (UE2405).
The later Series 1 models were fitted with a high compression (8:1) cylinder head (UE3764).
This meant that there were variations between the inlet valves and seats and push rods.