[jmarsey]

Ant,

The 358 is the maximum displacement allowed by NASCAR. Can be a 302 or 351 base with canted valve cylinder head.

Let me give you a tip. Although they could and it would be very cool, JBL won't be changing their basic platform any time soon. That's my bet. It's really a very big endeavor and I wouldn't worry too much about it.

Barry Grant just came out with an aluminum 3 valve head for the Chevy sb and it's a bolt-on. It uses (2) 1.4" intakes that run off one push rod. That's 2.8" of intake valve. And, they are lighter so less spring pressure is required. As usual, not Ford....yet.

John