X-heads vs J-heads: what's the difference??

Hey Snake,

You don't think you were the 'First' to port out Goldie do you........

That Odometer had spun around the 'Dial' a few times before you got there.

Goldie Hawn >
"I always go with the 'X-Heads'. Stock vs. Stock, they have proven to be more responsive
than the 'J-Heads' during the high RPM's at the Track."