> Is there a way to identify OEM valves without pulling the head off. The OEM
> valve retainers will be the multi-groove type - but can you 'see' this without
> removing them?
Yes. Look at the retainer where the keepers and valve stem stick through.
If the keepers butt together, you have the OEM parts. If there is a gap
between one side of the keepers then you have aftermarket keepers and likely
single groove valves, though there are aftermarket multi-groove keepers.
Dan Jones
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