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Name that motor!

To: triumphs@Autox.Team.Net
Subject: Name that motor!
From: Scott.Mackay@SEMATECH.Org
Date: Tue, 24 Feb 1998 15:34:36 -0600

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     Ok folks, 
     
     after some informal checking with people and manuals, and scouring 
     everyone's pages, I have been unable to determine the vintage of a TR6 
     head that I have and have been forwarded to you knowledgeable beings 
     of TRivial facts. 
     
     Facts:
     
     Head number is #216???, single valve springs, no EGR port or blank.  
     The block it was delivered with is a late '72 (CC something) but may 
     not be the same engine.  I have compared it with an early head 
     (#256???) verified by an early intake manifold, the mystery head has 
     different casting ID marks but earlier number.  Compared to a late '76 
     head (#356???), the mystery head has the obvious lack of an EGR port, 
     different casting marks and an earlier number.  I haven't observed 
     (nor have I paid any attention) if this magical -B- (or is it -P-) is 
     stamped in the top surface.
     
     Assumptions:
     
     I assume that the mystery head is earlier than '73 from the lack of a 
     EGR port/blank.  I have made rough comparison measurements from the 
     outside of both early and late manifolds and cannot tell the 
     difference between the port spacings.  since the other engines are 
     running, I am loath to disassemble them.  I have not measured 
     thicknesses, but also do not have the chart for thickness vs 
     year/compression.  
     
     Any ideas?  I am thinking that it truly is a '72 head (later manifold, 
     higher compression), but don't know when the transition to dual valve 
     springs was made, nor do I know how different the port spacing is 
     between the early and late models.  What really throws me off is the 
     numbering, has anyone documented the numbering sequence for heads as 
     have been done for blocks???
     
     Other questions for TRivial pursuit:
     
     When was the transition from front draining oil pans to side draining?
     
     What are the differences between a '72 block (with recesses) and a 
     '73-76 block (with recesses)?  Details, people, details!
     
     Scott
     (trying to learn more inane facts)
     
     P.S. Prizes depend on quality of answers!  If it's something I need, 
     I'll keep, otherwise,....

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TO: triumphs-owner@autox.team.net

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