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"head" historian

To: mgs@Autox.Team.Net
Subject: "head" historian
From: gbaker@customcpu.com (Baker, G.)
Date: Tue, 10 Nov 1998 13:43:36 -0900
Everyone,
   There's got to be a "head" historian out there somewhere that can bolster
my confidence in whether or not to enlarge these valve seats.
Thanks,
Gregg Baker


>
>At 09:56 PM 11/1/98 EST, you wrote:
>>      
>>On Sun, 1 Nov 1998 13:59:20 -0900 gbaker@customcpu.com (Baker, G.)
>>writes:
>>>Rick,
>>>  My machinist wants to put a set of 1 5/8" OD intake seat in my 1956 
>>>MGA head
>>>for cleanup work of a previous owner.  We're both concerned about 
>>>hitting water.
>>>What do you think?  The original seat was 1 9/16" OD.
>>>Thanks,
>>>Gregg Baker
>>
>>Gregg,
>>  I'm not as familiar with the early "B" series engine as utilized in the
>>MGA, as I ought to be. But, it isn't that much different from the three
>>main MGB version.
>> On that head, the water jacket does not come that close to the intake
>>port or seat area. Cooling of the intake valve or seat is not a problem.
>>(exhaust is another matter).
>> So, going up to a 1 5/8" seat shouldn't be a problem. We're only talking
>>about 1/32" additional radius, after all.
>> Do check though, that the additional seat width doesn't create "step"
>>from the port area to the seat. If so, you may have to do a bit of port
>>work with the die grinder to smooth out that area, to preclude any
>>restrictions that may pop up.
>> You might want to check with Barney Gaylord (he of the "MGA with an
>>attitude" on this list), to verify (or not) my thoughts. He's built
>>enough A engines, he'll have the answer off the top of his head.
>>Good Luck
>>
>>Rick Morrison
>>72 MGBGT
>>74 Midget
>>
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>


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