Originally Posted by Throttle Fever (Post 3873641)

You are right they will have the tendency to rebound better. That is why most high boost engine builders recommend them, usually the 2618's have no silicon, unless something has changed. But the movement has to go somewhere. They tend to be on the noisy side with the extra clearance, Ran some in the kids twin turbo WRX, performance was great, but the 4032's probably would of sufficed.

This is what my catalog shows:
BB applications 4.200 to 4.600" .0040 to .0050"
plus .002 to .004 for marine apps.