Happy wrenching...
daveS
----- Original Message -----
From: datsunmike <datsunmike@nyc.rr.com>
To: Datsun Roadster List <datsun-roadsters@autox.team.net>
Sent: Saturday, June 15, 2002 4:51 PM
Subject: New 1600 head
> Wellll, I finally received my new head and it tis a thing of beauty. It
has
> a better casting than any head that I have seen or worked on yet. No major
> flaws/air pockets/casting flash in the ports and the combustion chamber is
> quite smooth which is surprising.
>
> Of course I had to improve things and opened up the intake ports which
snake
> down in the port on stock heads and I probably gained another 1/4" of
flow.
> I also opened up the casting around the valve guides. I port matched the
> head to the intake manifold.
>
> The exhaust ports remain the same size except I radiused the edges so
carbon
> doesn't collect as easily and I also sanded and polished the exhaust ports
> in futherance of reducing deposits. I left them the same size because you
> shouldn't match the exhaust port to the header as the mismatch in sizes
> promotes anti-reversion which is important for exhaust scavenging.
>
> I also smoothed out the combustion chambers and polished them smooth to
> reduce carbon deposits and smoothed all the sharp edges so I don't get
> pre-ignition or run on.
>
> I'm planning for the machine shop to helicoil the rocker stud threads and
> the thermostat threads and install removable oil passage plugs which the
> head didn't come with.
>
> Goes into the shop on Monday and I should have my car up and running by
> Saturday afternoon - finally.
>
> Mike
>
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