I'm looking for some replacements and think the OEM is TRW, but have seen two types with differing faces.

I've found the folowing inlet valves:

R6060/S - Inlet Valve FRECCIA

V94167 - Inlet Valve AE

1973IN - Inlet valve OSVAT

537141 - Inlet Valve TRW Engine Component

Some are 34mm and others 34.1mm

and exhaust valves:

R6061/BMARCR - Outlet valve FRECCIA

V94168 - Outlet valve AE

1974EX - Exhaust valve OSVAT

537148 - Outlet valve TRW Engine Component

All these are 30.7mm

Any advice on the correct ones to buy?

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S Reg Diablo standardsSpec SORNED
R Reg Nile standard spec written off then repaired
X Reg Astor in need of TLC
R Reg Nile to restore
Set of Lions to fit.