All of the five bearing A series blocks use the same main bearings & rear oil seal, so the caps will be interchangeable, but i don't know if they are all the same.
I can't be sure that the later, larger engines didn't use caps made from a higher grade material than the 1200 /A12, or if they were more 'stout' in their construction. Only a direct comparison will clarify the latter question.

Use a bit of silicon if there close just to get the seal.

I reckon you will need to line bore it if you swap caps. But if the plastigage reads right, then maybe not.

Yeap lagwags, i assumed i'd have to line bore. Thanks guys.

I just realised i didnt answer the q's you asked, yes the caps out of A12/14/15 are all the same...
i just posted usless jargon, my bad

Dave

1 and 5 are the same, wider than 2 and 4 tho ( have a recessed middle i think)
2 and 4 are the same (flat usual ones)
but 3 has both edges shaped at a downwards angle and wider than 1,2,4,5 - so no their not all the same!

http://datsun1200.com/modules/myalbum/photo.php?lid=6191

You can just see in this photo that the middle cap has its edges shaped down, beveled is that the word? not sure why but it does ...

I stand corrected if ive said the wrong thing here....

Dave

i would have a stab and say yes. i'm picking you already know this, but if you use different main caps from a different motor you will be up for some extra machining costs to line bore (i think thats what its called) them with your block.

Morning all,

Are all A-series main caps the same? Reason being, i've got an A15 block and crank and no main caps, can i use the ones out of my A12?

Thanks guys.

Rhys