What cam do you have? I'm looking for A-series stuff

Lorne (ice racer)

"This is essentially what Nissan did when they made the late [1980 onward] A13 engine. The only diference was that the rod was made for the larger wrist pin of the A14 piston but the rod was the same length as the A12."

My experience with the A13 engine is different. In Canada and the U.S. I assume, the A13 has the same bore as the A12 (73mm) but a longer stroke (77mm vs 70mm) and a taller block. The A13 rod is longer than the A12 but keeps the smaller wrist pin. A13 rods can be used in A14's or A15's but the wrist pin has to be enlarged to 0.750". The later A12A has the taller block and the longer rods but retains the short stroke crankshaft. This was probably because of manufacturing simplicity. To further complicate things, it is possible to use the A14 or A15 block (taller & bigger bore), the A14 or A15 rods (longer for more torque) with A14 pistons and the A12 or A12A crank for a really short stroke, high revving screamer.

I am building an A13 race motor with 77mm stroke and 75.2mm bore Arias pistons for approx. 1290cc's to fit within SCCA GTLite regs.