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    Difference in performance from 21p to 23p?

    I know this is a vague question, so just humor me haha. The boat I just bought came with a dead engine (454, Gen VI - light mods, probably 370hp) and a 21p 14-3/4" Viper SS prop. I yanked the engine and put in a 500hp 454 (bored 468, 10:1, dyno) and had the first run a couple weeks ago with...
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    Trim sending unit test w/ voltmeter?

    So I was out on the water the other weekend for the first time and while hanging out in the cove I wanted to see if I could get some things working (it was more of a sea trials kinda thing, first time with new motor - the critical stuff worked but it still needs tinkering :rolleyes: ) Anyways...
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    Installing new 454 on new (to me) Donzi 24' - best prop for top speed?

    I got the boat with a dead engine, and I was laughing a bit at the fact that it came with a Viper 3 blade 21p on it - the guy said it ran in the 70s? The engine was a Gen VI roller cam w/ holley 800 and stainless marine headers. I just have doubts that a 21 could get that boat up to the 70s. A...
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    New boat (to me) King Cobra trim indicator no worky

    It's stuck in the full-up trailer trim position, I just took the access panel off the cockpit electrical area but I need to take a closer look. I prey it's under there, but if it's part of the drive, what should I look for first? This is the later generation King Cobra with the cone clutch...
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    Chevy 454 low power, now no start (new engine to me) diagnostic help please!

    So I'll try to keep it short and sweet - I just picked up a restored 24' Donzi Black Widow "as is" with a 454 that doesn't run. It had been winterized, and the engine is obviously not original (Donzi replaced the OE Ford 460 with the 454 in 93 as a recall on all these.. boat is a 1990). It's...
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    OMC "daddy" King Cobra - new owner, things to check?

    I just picked up an old 1990 Donzi Black Widow with the cone clutch style late model king cobra. The boat has been restored, but the engine doesn't run (pretty sure it's something simple like a valve / pushrods.. Said it ran but made no power and rear cyl had no compression) but at the price I...
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    Cobalt Boats - "stereotype" if you saw one cruising by..

    I'm familiar with most of the manufacturer stereotypes at this point (I mean hey, we all talk ***** and buy into cliches and such - most companies these days make a good boat though :D ) BUT if you saw a Cobalt cruising by (nothing over the top, just a 20-24' bowrider or something) what would...
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    Thinking about buying boat w/ Bravo III - easy to change props? Less prop options?

    Hey everyone - as some of you saw, I was thinking about buying a Nordic which was far away. Another option has come up and the guys made an offer that's tough to refuse. It's a 24' Cobalt (though with the hull extending out around the drive, it's gotta be near it's LOA of 26ish) - I think...
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    Thoughts about cross-country boat purchase?

    Hi everyone, I recently sold my 20' Yamaha twin jet open bow, which was my first boat - and I'm ready to move on to something without 2-stroke weed wacker engines ;) Actually I loved that boat and it was a perfect entrance into boating, but my friends at the lake all have performance-oriented...
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