It's not unheard of, but I wouldn't say it's a common problem. The seats are
staked in place in a few spots. The Bob Sharp manual recommended running a
whole line of stake points around the valve seats, but that was for racing.
> -----Original Message-----
> From: owner-datsun-roadsters@autox.team.net
> [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of C. Halsted
> Sent: Monday, June 14, 2004 8:07 AM
> To: datsun-roadsters@autox.team.net
> Subject: valve seats in a U20
>
>
> has anyone ever dropped a seat in a U20 head? a local fellow just
> pulled the
> head off his 2L and one of the valves is open and seat has obviously moved
> and looks to be the reason the valve is open... is this something that
> happens over time? he said he was driving it around the neighborhood, came
> home and shut it off, and next time he started it it ran like
> crap...couldn't even get it to rev... checked compression and #3 was Zero.
> pulled the head and observed the seat. I have pix I could e-mail if that
> would help in diagnosis. thanks for any input!
>
> Craig Halsted
> roadsters mostly
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