Stephen,
The two things to consider on uprated bolts are: age and comp. ratio.
As for age if the bolts have been used a few times: IE been off and on.
This allows the bolts to stretch and weaken to in extreme cases,
failure.
A higher comp. ratio just speeds this detioration up. The con rods
will see far more stress than main caps.
The above can be applied to head bolts also.
Good luck
Bill
"Hill, Stephen M EDUC:EX" wrote:
>
> I am gathering bits for warming up the TR6 in my 1972 TVR. My plan is
> triple Webers, increased CR, flowed heads, lightened flywheel, lightened
> valve gear, cam etc. I hope to go from 105hp (detoxed US engine) to about
> 160 hp.
>
> Moss sells a competition set of head bolts and con rod bolts, costing about
> $200 US on sale. Is this recommended? Essential? Optional? A waste of
> cash? My instincts is the head bolts are unnecessary, and the con rods
> bolts are more important, but how important I don't know. However, if one
> is uprating conrod bolts, why not main bearing cap bolts (which don't seem
> to be available. I would appreciate any feedback from the TVRheads on the
> list.
>
> Stephen
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