The Natural Philosopher wrote:
Quite right. The old A series high comp engines in midgets and the like
worked better on 5 star, especially once you got them to breathe a bit
better and sorted out the timing a bit.

They WERE designed to work on 5 star. Especially once I had finsished
with em.

OK, you say you've done some performance tuning on "A" series engines.
What did this comprise of. Be specific. I don't think you know what
you are talking about, so here's a chance to redeem yourself.