[TR] How smooth does the face of a block really need to be

[David P]

While on this general subject... the 250 and TR6 blocks have a ledge 
machined into the top couple mm of each bore, presumably to allow a bit 
of the head gasket to seep into this space. Does anyone have a better 
explanation?

Has anyone had this ledge removed by decking the block and if so were 
there piston to head clearance issues?

DaveP

On 12/12/2018 10:38 AM, TERRY SMITH wrote:
>
> I'm probably in the minority here, but I measure the effort/expense of 
> doing it 100% right, against the effort/expense of fixing it if it 
> doesn't work.  If the block is already out, seems little effort and 
> minimal money to have it skimmed at a machine shop, with the added 
> advantage that they'll boil the block, thus cleaning any years' worth 
> of crud out of the water channels, and check the block for cracks.  Am 
> I glad I did that?  Yes.  When I took in the block that was original 
> to the car for checking, the machinist found cracks where the liners 
> sit.  I'd have had to pull the engine and start over, assuming I 
> hadn't ruined it altogether already.  Instead, I sourced a free block 
> from a List member in CT, and was golden.
>
>
> Your experience may vary and all that.
>
>
> Terry Smith, '59 Tr3A  TS 58667
>
> New Hampshire
>
>
>> On Mon, Dec 10, 2018, 12:58 PM Sujit Roy < triumphstag at gmail.com 
>> <mailto:triumphstag at gmail.com> wrote:
>>
>>     I've been at the block face of a Stag's engine with a Roloc. (The
>>     block has been sitting in my garage for may years.)
>>     I have noticed around the water channels some imperfections on
>>     the surface. The rest of the block face is relatively OK.
>>
>>     Can I get away with not having the block face decked?
>>
>>     Sujit
>>     -- 
>>     Sujit Roy
>>     Cupertino, California
>>
>>     https://triumphstagblog.wordpress.com/
>>
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