The stroke of the A12 is 70mm. All the larger engines are longer. A14 is 77, A15 is 82, E15 is 82.
The lower compression height/pin height means the distance from the centre of the gudgeon pin tot he top of the piston so a lower comp height should also give lower compression. Additional
porting of the combustion chamber will also help.
The comp height of the A15 was 30.00 as opposed 32.40 on the A12. There is also a piston for the 76-78 Honda Accord that has a 74mm bore and comes in a 74.75 oversize. It has a 27.1 comp
height and a 17 mm pin dia.
O ringing is fine but if the motor is set up properly it shouldn't really need them. It is really an answer to another problem. Eg compression to high, to much boost, to much ignition,
fuel octane to low. All of which leads to detonation (erratic combustion). I believe a motor set up properly should not need it. If you were running that much boost that you needed them
then I suggest the rest of the motor would not last long unless you are using forged pistons and custom rods. Hardly worth the expense in a pushrod 1200 I would suggest.

What about putting E15 rods in too? is this possible? if not can you get rods which will allow me to do this? are there any other pistons which will lower compression for a
turbo in an A12?

I'm planning to reco my engine anyway so I may as well spend some money on the internals... Should I get the block O ringed?

I doubt you would get them to fit as the spacing is bound to be further apart given that the head is not cramming both onto the same side.If you measure them up I'd bee keen to
know the outcome.

They came out in the Pulsars and are of course FWD. They are compact looking motor with cross flow head and belt drive overhead cam and there was a turbo version. I have had a bit of
a look at one as I was hoping that the same gearbox was used in the Pulsar for both motors (first came with a14). I don't know about that yet but there is not really any straight
forward engine mounting lugs that I can see for RWD fitment and the distributor and water outlet poke a long way out back of the head.

Don't forget the first Aussie Pulsars had the a14.
I have all the spec sheets for ACL pistons copied out of Repco's parts lists lent to me by a friend. Some details are:
A12 A14 A15 E15
Bore 73mm 76mm 76mm 76mm
Comp Height 32.40 No 30.00 32.50
Pin Dia 17.45 Specs 19.00 19.00
As you can see the only hassle with the E15 piston is that the pin might be too big. You would have to look whether there is enough meat in the little end of the A12 rods. The picture of
the piston design gives the impression that the E15 has a much larger dish which would lower compression but of course with a turbo that would be fine. I don't know why there is no
listing for the A14 pistons but that is what is supposed to be in my spare 1200 motor so I don't know what the pin size is.

I have had a look at the Turbo manifold, the exhaust is not the same, I'll probably be fabricating my turbo manifold, by cutting and welding it onto the existing exhaust manifold.
I'll put up some pictures, and let you guys know how I go.
BTW This car is my second car so I wont be spending too much money on it I'm trying to limit my spending to $AUS1000.... hehe

Thanks, that site gave me some leads. Now, has anyone here tried the turbo manifold on an A series engine? Is that manifold readily available? What kind of longevity do they
have, are they prone to cracking?

The E15 engine came in N12 Pulsars (83-86) and Turbo Versions Came in ET
pulsars and Early Exa's
Try this link below for a little more info:-

http://www.slosh.com/cars/pulsar/history.html

Can you tell me a little more about the E-15 engine? I don't know anything about them. What did they come in? Are they overhead cam? I get the impression that there was a
turbo version from some of the comments, was there? Any info will be appreciated.

I can't remember where I heard about the blocks being the same, I think it was a mechanic (so it could be wrong) He reakons Datsun bought the molds from Morris (in UK), then bored
it out. He said something about using the same block in N12 Pulsars. So I was thinking maybe pistons out of an E15, into a Bored out A12, and maybe the turbo too! =)

Anyone from New Zealand? I know manifolds are easier to come by over there, anyone know of any A14 EFI manifolds?