What are 12G1507/8 con rods out of?
I have a reference for a 1275GT but can't confirm that - Aussie or Pommy?
Are they a good quality factory con rod?

I think you will find they are numbered 12G1506/8 in parts books.
[There is a discrepancy of 1 digit between cast or forging numbers, and part numbers.
For example, C-AEA648 and 649 are the same race camshaft].

Big journal A series `lumpy cap' rods, used here in late GT, Morris 1100S, 1275 Moke, and 1275LS.
They were the rod used here, and also UK before the lighter A+ ones came in ~1980.
I confirmed by looking at pics on the web-
http://www.theminiforum.co.uk/forums/to ... 0-pistons/

They work OK for most use, but IMO the caps need lightening, I'd mill 8mm off the lumps and rebalance them. Fit new ARP bolts.
You want better [aftermarket] rods for a race motor, IMO.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks for the info, definitely have 12G1507/8 cast on the rod.