Here we have a chart giving part numbers for pistons and connecting rods for Austin B-series engines for MGA and MGB. It does not show the deep dish Low Compression pistons originally issued for use in countries with lower octane petrol. And it does not show any of the dash numbers for larger overbore pistons. But it does show wrist pin sizes and the conditions when you need to switch to Twin Cam type con-rods for performance upgrades. Click to download a larger printable PDF document