[Healeys] Manifold bolts

Mark Donaldson ardmorebusiness at xtra.co.nz
Fri May 20 03:37:17 MDT 2022



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







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