BOATING vs PORTING

One of the performance conditions with boats is that there is usually a lag or bogg from idle rpm up to the point where your cam kicks in and the airflow becomes efficient. That can be sometimes 2000 to 3500 rpm. There are two methods of reducing this lag that I use. One is porting and polishing, along with a special valve grind, and the other is either an aluminum flywheel or replacing the old stick shift heavy flywheel with a flexplate from an automatic. Sometimes you need to make a spacer to go with the plate. I remember a 18 ft. jet boat with a 455 Olds. that we put a flexplate on and the special valve grind. It removed all lag off idle. That boat really jumped when you smacked the throttle. We never got around to the porting on that boat. Too bad, I would have really enjoyed seeing the gains there. Anyway, for those of you with boats who want that off idle snap, and are tired of the lag/bogg and want to plane-up quicker, I highly recommend these two upgrades. Dr. Denny