More hours logged with GM BBC hydro lifters in marine than any other roller? These are very reliable when kept with good lobe design and within spring rate specs.

I have SM exhaust...I'll be fabricating 3" dia risers. Maybe I'll add a small dam at the short side.

Largely also depends on wjere you introduce the water. If not from the top..like the Merc style does...it won't atomize so early and close to the riser elbow.

110/112 LSA factor is also about total overlap factors.