Consider:
All the variable valve lift, phasing mechanisms available, or soon to be released
Direct Injection trends
Corporate preference to improve a given current head
R&D on a new head/chamber/ports
Expense of head development and continued updates
Arbitrary bore size choice a head selection defines
We have decided it was lower cost, more flexible, and useful to use current OEM cylinder heads.
Those going they’re own way where a current OEM doesn’t work, will build they’re own, usually as a single cylinder prototype. Note that we can help w/ design and fabrication of quick turn billet or lost foam heads.
