did search...
a10, a12=73mm, a12a=75mm, a14 a15=76mm, mythbusters inc

I thought that A14'a and A15's had a bigger bore than the A10/A12

the stroke is definitely longer...

dont they all have the same stock bore, just the stroke varies?

A10 pistons in an A14?....Bore???

Or do you mean A10 pistons on A14 crank?

i guess a test of 1 isn't gospel so we'd need to look at more.. Dodgeman could have some answers..

so using KB10 flat tops in an a14 with a12 head not such a good idea then?

I'd say A10's in general,
they have an old style piston with and expansion gap and one piece oil rings,
two of these ones had a crack under the oil rings on the opposite side to the expansion gap.. it was a stock motor in reasonably good condition..

When you say old school A10 pistons, do you mean the earlier ones were different? or just old A10 pistons in general.

I replaced the gasket on my A10 a month or so ago and it is still the original- shim style gasket with material over-lay.....as far as I'm concerned those only came out at factory?

It's a spin out if it was the orgiginal gasket. 40+ plus years without a gasket change, is that a good thing or a bad thing!

That really is brilliant. There is nothing like the satisfaction of getting stuck into a project like that.

Cheers

on a bit of A series questing today..

Plan A, Old style A12, sweet, oval head drop into 1000, hmmm piston is damaged, that's ok, orphan 120y short on the floor, fark.. the Old A12 is 1mm over.. plan aborted..

Help out Weekend to revive the A13, what motors you got laying about.. sweet.. old Style A12.. back on track, strip it down all good so far,

hmmm A10 on the floor too.. sweet.. flat tops for the A12.. strip it down.. sheesh old skool A10 pistons are weak and a couple are cracked.. back to stock pistons..

all in an Arvo's work..

Current Plan, A12 (old style bolt straight in) A15 oval Head, Massive cam, Rocker shaft spacers, GX double springs, GX Carbs and A15 exhaust.. Electronic Dissy..

sweet, all for the cost of a re ring Kit.. and many years hoarding..