Her is another one but you have to register to watch it.
It's no biggie .. Name and E-mail to register.
This was back when Darin was working for MAST Motorsports.

Its 1-1/2 hour long and at the last of it, the video goes blank and they start a Q&A session.
At 1:31:48 A question is asked about Swirl....................................

https://register.gotowebinar.com/recording/7570420535400895489?assets=true

 

Some time in 2022 Darin is going to give a webinar that he gave at PRI this year. That will be worth listening to. It’s about under valved cylinder heads.

 

Big cubic inch stuff is what they covered.

 

I figured that would be the focus of the lecture. I’m of the opinion that virtually all 2 valve wedge heads are under valved. I use the 52% rule, but it also doesn’t account for stroke length.

 

Definitely worth listening to. They get into some pretty extreme efforts at making HP

 

Post it up here.

 

I will as soon as I get notified when it will happen.

 

Thanks

 

That’s why most u tube videos are 10 to 15 minutes long. It tuff to find 3 too 4hours