[Healeys] Manifold bolts
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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