[Healeys] 100/4 (A90) Piston Question

Alan Seigrist healey.nut at gmail.com
Sat Dec 15 06:47:11 MST 2007

Hi All -

I have the rods and pistons out of the old lady and we are trying to
determine the current bore on the car because she only needs new rings (one
of the rings is broken).  I can't tell if the pistons are oversized because
there are no size markings on them.

The only thing the piston says on the top is:


No other markings.

Am I to assume these are Std/factory bore with these markings?


'52 A90
'53 BN1
'64 BJ8

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