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Purpose of recession on deck around cylinders

To: "Triumph Mailing List \(E-mail\)" <triumphs@autox.team.net>
Subject: Purpose of recession on deck around cylinders
From: "Hugh Fader" <hfader@usa.net>
Date: Mon, 25 Feb 2002 05:39:45 -0500
While we were pulling my engine on Saturday, the fellow helping me commented
on the recession in the deck at the top of the cylinders. As I understand
this is only on the later TR6 blocks. What purpose do these serve? It can't
be for emissions. My friend is a veteran powertrain engineer. He says that
this will add crevice volume and increase hydrocarbon emissions.

Just curious if anyone knows.

- Hugh

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