4vs are alot better than the 2vs and this is as cast, before porting. If you read my post above yours, the are direct replacements and TF is working on a versions for even more power with a blower. How much time and money is it goin to cost to get a 4v setup together and running well?
4V's arent just better as cast, they are a better design period.
If trickflow did the same work on a 4V head it would absolutely destroy their 2v.
Look at any "performance" honda engine, nissan engine, toyota engine, motorcycle engine, indy car engine, etc. ALL of them are DOHC.
Hell the s2000 makes the most HP per liter, what do they have DOHC.
As far as the "best" head design goes... 4V FTW all day. As far as practicality for those that don't really need 4V and up performance. trickflow...