Been enjoying the car but still pondering where to go next in the quest for more NA power.
I have spare head I have been studying and looking to see where gains could be made, and my eyes are drawn to what appears to be shrouding in the combustion chamber.
The intakes have a nice 3 angle valve seat, but the transition into the combustion chamber doesn’t seem ideal - it steepens from back from 30 degrees to 45 degrees. Also the proximity of the edge of the CC near the gasket to the intake valve also appears too close.
Some hot rodder articles I have read mention de-shrouding up to 1.2 x the valve diameter - this would be 36mm for the 30mm valve in an H-Series.
I like what this guy does to a V8 head:
Love to hear from any other experts out there! Anyone seen well prepared H-Series head?