Seems like there has been a big influx of porting knowledge being displayed on the interwebs lately.
From Holdener doing some basic stuff FIRST TIME EVER and picking up good numbers to David Vizard getting on youtube.

I'm using an old article from Dulcich to do these.

Couple other guys Ive found on YT are Charles Sevedio, Eric Weingartner, Tom Mews (long winded) and also
Terry Grover (good listen on 1.5x speed lol).

Here's my attempt working on 2nd head exhaust first.

[video:youtube]wkoC6aqMeIQ[/video]