I have a spare late, smog R16 head that does have brass intake seats and
steel exhaust seats. I'm scratching my head wondering what is the reason for
this if it left the factory that way. I'm confused by the this and other
info I've read, and maybe I'm just not reading it write. I'm hearing that
some say to replace intake brass with steel seats, and others saying to
replace brass exhaust with the steel ones. It seems like it should be steel
for exhaust seats because of the heat, but why would brass be a problem for
intake valves? Need some techno here!
Which is what? and why? ........again please.
Mike Hudson '67 - stroker / 5-speed
----- Original Message -----
From: "Steve Ehlers" <stevenehlers@charter.net>
To: "Daryl Smith" <drlsmith@dccnet.com>; <datsun-roadsters@autox.team.net>
Sent: Monday, September 15, 2008 7:37 AM
Subject: Re: [Roadsters] Valves leaking while cc'ing
> Hi,
> If you have Brass intake seats ,which are sock , They MUST be
> replaced .They will be pounded-out and a stock valve will be "sunk" in
> the head and will fall out of the head eventually .
> If you have steel ,or a derivative ,you may be ok . That said ,
> Nissan does not publish actual valve heights/ Stem lengths ,so they
> could not duplicate the dimension . They may have had spring heights
> dimension ,that is controlled by this number ,however their method
> would have involved using valve shims under the valve springs .This
> doesn't change the relationship with the actual stem length ,or valve
> position relative to the seat . Since you had them install bigger
> valves ?? , that would have raised the valve and made stem lengths
> shorter
> than spec ,possibly . Anyways , Seat material used in the 1960's was
> designed for Leaded Gas ,how would they know ,unless the seats
> had bean changed ?
> Steve Ehlers
> www.risingsunperformance.com
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