Okay, so trying to get quench is a stupid idea. No problem, I'll move on. Thanks for the frank comments, saves me continuing to pursue something that is questionable with this design.

Unfortunately it's been 50 years since I was inside a poly and I can't remember anything about it other than if you miss a gear and you see the tach going past 6500, you will bend a lot of pushrods.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".