Have sent you a seperate email attaching a spreadsheet which details the
various heads fitted to the six cylinder range. According to the spreadsheet
the standard head fitted to the 74.5 is the "219019" and it is 3.5" thick.
The 219019 number is stamped onto the top face of the head on the manifold
side at the front of the engine.
Hope that this helps.
Date: Sat, 5 Jan 2008 02:21:06 +0000
From: "Foster, Stan" <firstname.lastname@example.org>
Subject: Re: [6pack] Compression ratio calculation (Was Headers)
To: "email@example.com" <firstname.lastname@example.org>
Content-Type: text/plain; charset="us-ascii"
The TR6 compression ratio was gradually reduced over the years from 9.5:1
PI) to 7.5:1 in 1974 (US version). I realize that there was a change in head
at least once during that time but was all of the compression ratio
achieved via milling the head to a desired thickness ?. Do we have head
thickness data for the various years and in particular my immediate question
is regarding the thickness of the standard 1974.5 circle B head.
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