Re: [Fot] difference early and late TR6 Cylinder head

[Ted Schumacher <tedtsimx@bright.net>]

Bill, short answer - the longer the run, the lower the power band. 
Shorter the run, higher the power band. With the engines being "choked" 
by US emission requirements, going to long runner manifold, in theory, 
offset some of the power loss.  Or, it at least allowed the car to get 
out of its own way at lower end.  Port spacing - early heads had a 5/8" 
space between intake ports.  Late heads had a 7/8" space between intake 
ports. Ted


On 10/7/2014 7:53 AM, Bill Tobin wrote:
> This brings up another qustion: what's the difference between a long 
> branch intake as opposed to a not-long branch (short branch?)?
> Part numbers? Usage?
> This bunch is a treasure of information!
> Thanks, Bill
> ----- Original Message ----- From: <rkramer3@austin.rr.com>
> To: "Henry Morrison" <dos_gusanos@msn.com>; "Robert M. Lang" 
> <lang@isis.mit.edu>
> Cc: "fot" <fot@autox.team.net>
> Sent: Tuesday, October 07, 2014 7:39 AM
> Subject: Re: [Fot] difference early and late TR6 Cylinder head
>
>
>> I have a 1972 TR6 CC75059LO, the 59th (or is that 60th) car after the 
>> switch to the dual exhaust and long branch intake manifold. I always 
>> that the 1972 model (built in 1971 in this case) was the point in 
>> time for the cylinder head change. I gues the head may have been 
>> around for the PI cars prior to the USA change.
>>
>> Bob Kramer
>> rkramer3@austin.rr.com
>>
>> ---- "Robert M. Lang" <lang@isis.mit.edu> wrote:
>>> From the Goodparts web site:
>>>
>>> http://goodparts.com/shop/index.php?categoryID=36
>>>
>>> scan down to the manifold gasket section.
>>>
>>> Early has 1.875 spacing (center to center)
>>> Late has 2.187 spacing (c to c)
>>>
>>> c ya,
>>> rml
>>> --------------------------------------------------------------------------- 
>>>
>>> Bob Lang              Triumph TR6!!            |  This space for rent
>>> Former NER Solo Chair                          |
>>> Voice:617-253-7438                             |  Cell: 339-927-4489
>>> --------------------------------------------------------------------------- 
>>>
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-- 
Ted Schumacher
tedtsimx@bright.net
http://www.tsimportedautomotive.com
108 S. Jefferson St.
Pandora, Ohio, USA 45877
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