Slant 6 Aluminum Performance Head
Cross flow hemi can get larger valves in there. Would need pent roof pistons to boot. How about just a mod to get us taller ports? Cross flow exhaust on passenger side, go to a Distributorless ignition system (EDIS, crank trigger, etc) and remote oil filter to clear up the passenger side and you'll have plenty of room for some hemi style downward pointing headers. Some college CNC final on the 5 axis Okuma with 2 billets of Aluminum, make it 2 piece: top and bottom with routed water passages between the 2. Send the finalized part to China and have them cast 1000 of them so you can get your tooling cost back and make a profit. Just make sure you look at the first one very closely to see if its worth a flip. Sounds like something Dutra could get Clifford to back. Youll probably sell 100...at $800? Edelbrock make a 4.0 AL head...$1500.