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What the ....!

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UKROBK7:
My thoughts as well.  Unless I was going to build a performance engine I believe I should leave the parts as original, the thought of loosing a valve head after all the work I've put in terrifies me!

rob

UKROBK7:
Update. 
The replacement guide went in OK, head (not mine but I felt like it) in the oven and guide in freezer.  Measured guide OD before fitting and it was 12.04mm.  I believe the head is reamed 12mm so there is 0.04mm interference fit (0.00157" in old money).  I cleaned the guide and hole before fitting and turned up a 'guide' for the guide to keep it square to the head, I still can't believe these are so tight to get in.

Replacement inlet valves arrived from D.S but were sent back as they had slight corrosion on the stems and seats (you have to watch NOS parts for storage and handling problems) which I felt would ruin the nice new guides and seats.  No problem, good service as always, they ordered in new Honda items as they are still available.  Looks like the seat cutting has been put back another week!

Rob

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