When the block was decked, they may have cut the recesses for the later style
gasket.
Shawn
>===== Original Message From "Foster, Stan" <stan.foster@hp.com> =====
>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@autox.team.net
>[mailto:6pack-bounces+stan.foster=hp.com@autox.team.net] On Behalf Of Brian
>Sent: Friday, March 07, 2008 5:36 PM
>To: 6pack@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
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