Any updates on the going with the huge throttle body and head porting?
Did you start with the regular 4V or the 5 axis ported version?
I started with the regular 4v. At the time I got it, you couldn't get the 5 axis in silver and I didn't see the value in getting the 5 axis if I was going to port it bigger anyway.
I've decided I'll get it ported professionally. The workshop that's doing it is closed until the 4th of January, so that's when I'll tear it down to put in the takegawa 5 speed as well.
The 37mm is overkill on the standard 28mm port. My 1/8th mile times haven't changed on the dragy, so that means there's probably no difference in top end power between a ported 34 vs a ported 37 when using the standard port. It'll only come into its own once its ported.
For reference, the takegawa intake port size is 28mm standard or 30mm for the 5 axis. Exhaust port is 23mm on both. I'm asking for 33-34mm in and 27mm ex, which is 43% and 37% larger, respectively. I don't have one, but I've been told the koso intake port is a 26x38mm pill shape (equivalent circle diameter of ~32.5mm). I'll be sure to post some before and after pics in January.
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