[Healeys] Manifold bolts

[Michael Salter]

UNF Mark.

M

On Fri., May 20, 2022, 10:37 a.m. Mark Donaldson via Healeys, <
healeys at autox.team.net> wrote:

> Listers,
>
>
>
> I have a question about the four bolts that secure the intake manifold to
> the exhaust manifolds on our 6-cylinders.
>
> Over the 60 years the threads between the aluminium (note correct
> spelling) and the cast iron have been sacrificed, rendering the bolts
> unreliable.
>
> The parts manual tells us they are: *HBZ 056  *-  3 ¼” x 5/16” with the
> end thread 1” long.
>
>
>
> Though an unusual bolt, I think I can source them here in NZ.
>
>
>
> My question is:  *What is the thread?   UNF or BSF*
>
>
>
> TIA
>
>
>
> Mark
>
> Ardmore
>
> NZ
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