This thread has moved beyond the classifieds but I'll chime in.

Non-cross flow A-series have power outputs from 140HP for A-12 and 185HP for A-15, with the redlines around 9K. The heads have been highly developed by tuners who do not have anywhere near the resources that nissan would have.

I also know that E-series crossflow head on A14 is pushing the 190HP mark in full race trim but like the A-series race motors they'll only do a weekend at a time........4-6 hours running time.

Nissan could have put in 3000 hours of testing time on these so it is possible that their sprint / qualifying engine was at this level. I would expect at least 175HP from the AY12.........unless we can get Alan T or his Japanese friend to show us the ports it's hard to speculate. Many bike manufacturers were getting huge outputs from their tuned road bikes in the 70's, 200hp is possible.

Tom

Now back on topic............,maybe someday we'll get one of these heads at less than the price of a complete Cosworth BDA.