I have a 2004 21 lightning with a 350 mag mpi & bravo 1 setup. I'm looking for options to get more speed out of the boat with possibly an engine upgrade. The current motor only has 200 or so hours on it and runs good but just not fast enough for me anymore. I played with alot of props with the help of Brian at Valley prop in Ventura and I'm where I need to be RPM wise (4800 - 5200) 17 - 19 pitch. The best I've seen out of the boat was 55mph with 3 people and low on fuel. Most of the time I run around with 5 people, somewhat loaded down, a big stereo system and hit about 51mph.
What are my options with wanting to stay turn key and reliable? I've heard about whipples and also had some people mention the 383 strokers? I'd love to see the boat run 65 - 70 or more.
My mechanic has looked over my current motor many times and says there is absolutely nothing wrong with it. I just need more horsepower I guess to turn a bigger prop to get more speed?
I talked to one of the builders of these boats (John West) and he said I should be able to run a Merc High Five 21p all day long at 60mph. I tried this prop first, could only pull 4200 RPM at 50mph and it was a dog out of the hole.
I have not had the engine put on a dyno, I don't know about place around me (Ventura County, CA) that has one.
Any advice without breaking the bank?