Jay said it, others backed it and I'll add to it- big block. I've played Floyded axes for the better part of 24 years (DON'T do the math) and I never bought into the hype around the big blocks until recently. I put one on my Cali LE and WOW! I could really hear and feel the difference. I'm not gonna say the Big Block is the only thing that impacts the sustain and feel but in the case of that Cali, it was. Brooks, you da man! Love your style. Folks that can't/won't pull up on a Floyd are just not getting the whole benefit. Period.