[6pack] Cylinder Block Identification

[Foster, Stan]

According to the Moss web site the recessed bores came in starting with 1972,
at least that's how I interpret their head gasket listing:

694-540          $17.95         GASKET, cylinder head           TR250, TR6
thru 1971
694-640         $21.95  GASKET, cylinder head           TR6 1972-'76



-----Original Message-----
From: 6pack-bounces+stan.foster=hp.com at autox.team.net
[mailto:6pack-bounces+stan.foster=hp.com at autox.team.net] On Behalf Of Brian
Sent: Friday, March 07, 2008 5:36 PM
To: 6pack at autox.team.net
Subject: [6pack] Cylinder Block Identification

Dear Listers:

I would like to submit a mystery for discussion. I'm doing a top-end rebuild
in chase of a leaky intake valve on my 72 TR6 (CC79085).

When I pulled the head, I noticed that it has a recessed-bore block type.
My car was built in Jan 1972, and I thought the recessed-bore blocks
appeared after 1972. My understanding is that my car has the original
engine. The stamping on the deck boss is 7717 U. The block was decked when
the engine was rebuilt a couple of years ago, so perhaps the prefix is
machined off. The numbers 7717 U itself must yield some clues.

When were recessed-bore blocks introduced?

Thank you,

Brian J Alwin
Minnesnowta