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Re: [Fot] How many times can you line bore a block?

To: Chuck Gee <chasgee22@gmail.com>
Subject: Re: [Fot] How many times can you line bore a block?
From: Philip Gott <vfracing@aol.com>
Date: Mon, 27 Jul 2026 20:39:11 -0400
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Cc: Of Triumph Friends <fot@autox.team.net>
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References: <8131ACD2-2E03-4C89-B768-64A652200B24@gmail.com>
Yes, that is my understanding too. But according to my machine shop they do end 
up taking a couple of thousandths off the top of the journal. A couple of thou 
is within tolerance, but now weâ??re talking four thou or so, having to do it 
twice.  Getting a bit out of lineâ?¦.
They did say that if I had a bell housing that would unbolt from the gearbox 
they could â??dial it inâ?? with offset dowel pinsâ?¦.
But alas I donâ??t have such a bell housing kicking around.


Sent from my iPhone

> On Jul 27, 2026, at 6:20â?¯PM, Chuck Gee <chasgee22@gmail.com> wrote:
> 
> I could be wrong, but I donâ??t think line boring affects that dimension.  
> I understand it to be making the caps a little shorter then reboring to match 
> the upper diameter in the block.  
> 
> Otherwise, a bunch of other dimensions would be goofed up too.
> 
> Chuck Gee
> 
>> On Jul 27, 2026, at 4:56â?¯PM, Philip Gott <vfracing@aol.com> wrote:
>> 
>> Or another way to ask the question is â??how much misalignment between 
>> the crankshaft and transmission input shaft can be tolerated?â??
>> I had a block completely gone through, including line boring and it ran very 
>> well until number one cylinder liner suddenly split. The engine hydro locked 
>> and broke the crank and front main bearing cap. I have a new cap; to use it 
>> requires the block be line bored again. Iâ??m wondering if anyone else has a 
>> similar experience and can tell me either that it worked out well, or that I 
>> should throw the block away.
>> Thanks as always!
>> Phi
>> 
>> 
>> 
>> Sent from my iPhone
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