By connieowner
hi all, the threads in the top of my cylinder heads (59 Connie) for the head steady brackets are toast...thinking of helicoiling them. My question is...would it be acceptable to use a metric helicoil insert as these are a lot easier and cheaper to purchase? Existing thread is 5-16 coarse I think, is there any benefit in installing a fine thread to help cope with vibration? Any tips/suggestions gratefully received. Richard
By PeteF
No reason no to use metric accept for authenticity.
It all depends what sort of stuff you normally work on - will you use the imperial again? Or more likely to use the metric?
It's also a lot cheaper to buy a set of the most common sizes - again, depends if they'll get used again.
If it really is a one-off could you not borrow one?

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