4.3 Redline

[Steve the plumber]

My buddy has a 1992 Searay 21' cuddy. Its got a 4.3L V-6 Mercruiser. It came with a roller cam, a few years ago we put a Vortec manifold and heads off a newer boat on it. It ran strong for many an hour, he uses it alot. Last year he started getting blowby and we tore it down and found a broken ring. Anyway, im getting off the subject.

Anyone know the factory WOT recommended RPM for this motor?