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Porting and Polishing

To: "Datsun Roadster List" <datsun-roadsters@autox.team.net>
Subject: Porting and Polishing
From: "datsunmike" <datsunmike@nyc.rr.com>
Date: Sun, 18 Mar 2001 09:22:28 -0500
> In preparation of my H20 stroker project I am PnPing the head and intake
> manifold.
>
> I had to open up the 1600 intake to accept 2L carbs, although not hard it
is
> very time consuming . . . and messy. I also opened up the side that goes
> onto the head as after looking at several intakes I noticed there is a
> noticable restriction there as it necks down. I figure the whole intake
> project will take about 10 hours and that's with port matching the intake
to
> the head and cleaning up all the ports. Probably saved me about 200 - 300
> bucks doing it myself and the pleasure of doing it.
>
> I have practiced on a corroded head and came to the conclusion that when
you
> polish the combustion chamber put a used or cheapo head gasket on to
protect
> the head surface. The 1600 has a noticable neckdown on the intake port
where
> it meets the intake manifold which is easily opened up. I also cleaned up
> the rest of the port but it isn't all that accesible because of the small
> size. I was able to get some really good sanding cartridges at a jewelry
> supply store for my Dremel tool to get into those small ports and which
are
> especially useful on the exhaust ports as they are so tiny. I am polishing
> and radiusing the exhaust ports.
>
> I bought an S&A Abrasives deluxe porting kit, a 1/4" electric die grinder,
> and a whole bunch of sanding cartridges for my Dremel. I guess I spent
about
> 150 for everything but I probably saved about 600 as it's tres expensive
to
> get a head and manifold ported and polished. Malverne racing wanted 1700
but
> I'm sure they would do a better job and flow the head but I don't have the
> $$$$$ to do that and I'm sure I'm not alone. Rebello wanted 1100.
>
> I am finishing the combustion chambers with my dremel using the cartridge
> rolls and 1" treated dixcel buffs using aluminum polish. Boy do those
babies
> shine.

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