454 vs 502
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454 vs 502

  1. #1
    Senior Member wpy3's Avatar
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    Default 454 vs 502

    Can someone give me some general info on the 454 vs the 502. Which is the better motor, why. I see a lot more of the 454s in 19 and 20' than the 502s. Is that due to cost, parts, preformance? Going crazy trying to figure out the better boat/motor combo for a 19-21' jet boat
    Last edited by wpy3; 11-28-2008 at 03:48 PM. Reason: Kant spell

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    do yourself a flavor and build a 500 incher.

    CHET.

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    Gas Dock Greg 75 spectra v-drive's Avatar
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    Quote Originally Posted by wpy3 View Post
    Can someone give me some general info on the 454 vs the 502. Which is the better motor, why. I see a lot more of the 454s in 19 and 20' than the 502s. Is that due to cost, parts, preformance? Going crazy trying to figure out the better boat/motor combo for a 19-21' jet boat
    MK IV vs Gen VI I personely chose the first with an aftermarket block bored and stroked no replacement for displacement add a blower and you are good to gooooo.

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    You see more 454's because more of them are out there, much older engine. The 502 is relatively young.

    The bigger engine will make more power on the exact same build parameters, which is a good thing.
    If you are starting from scratch, go 500+ inches for pretty close to the same cost.
    If you have a 454, I wouldn't spend a fortune just to get the 50 cubes tho and would just build the 454.
    If the 454 needed a crank anyhow for the build, there ya go, 496 land is VERY close.

    I don't know if you can go any bigger stroke in a common GM block than a 4.250" stroke. I think the 4.5"ers require an aftermarket performance block to fit it into.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Gas Dock Greg 75 spectra v-drive's Avatar
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    thats good advice 4.5 stroke = aftermarket block (merlin or dart) on a Mk IV

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    Don't know if you want to use a mechanical fuel pump or not, but on my gen 5 502 there is no provision for mechanical. Electric pump only.

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    Senior Member wpy3's Avatar
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    I am looking at a 21 Daytona with a new 502 crate motor in it. I didn't know what the possibilities are with this motor or if it was even a good motor for future builds. I have been a SBC person up until now. This is a whole new world for me and I am looking forward to my first BBC.

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    Senior Member swtd's Avatar
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    Quote Originally Posted by wpy3 View Post
    I am looking at a 21 Daytona with a new 502 crate motor in it. I didn't know what the possibilities are with this motor or if it was even a good motor for future builds. I have been a SBC person up until now. This is a whole new world for me and I am looking forward to my first BBC.
    Dude once you go b.b. their's no substitute for cubic inches you will never go back!!!!! been there done that.
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    Senior Member H20MOFO's Avatar
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    The 21 daytona is a great boat,IMO I was told once that a 496 vs a 502 with all else being equal the 502 would make 30 or 40 mo horses.I know you asked about a 454 vs a 502 but hopefully that will give you an idea. Btw lets see the boat If you need help putting up a pic pm me I'll give ya a hand.
    Another Hot Boat refugee

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    21 Daytona Outlaw's Avatar
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    Quote Originally Posted by wpy3 View Post
    I am looking at a 21 Daytona with a new 502 crate motor in it. I didn't know what the possibilities are with this motor or if it was even a good motor for future builds. I have been a SBC person up until now. This is a whole new world for me and I am looking forward to my first BBC.
    my 21 Daytona with a 415Hp 502 ran 70 @ 3500ft elevation. it had a little more left in it because of the pump and loader, it also ran 77 with a 100 shot of NOS

    the best part was fuel economy, it got great mileage
    for a jet.

    the bottom end of a 502 is a nice building block for
    stepping up HP, Cyclone and Widowmaker have made some good HP with a 502 shortblock, and I'm adding
    a blower, rods and heads to mine, looking for 800+ HP
    #55

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    Quote Originally Posted by wpy3 View Post
    I am looking at a 21 Daytona with a new 502 crate motor in it. I didn't know what the possibilities are with this motor or if it was even a good motor for future builds. I have been a SBC person up until now. This is a whole new world for me and I am looking forward to my first BBC.
    Nothing wrong with that motor to build, you can make lots of muscle with the right build in it. As miller said, Gen V's do not permit a mech. fuel pump, but, while I prefer one for a variety of reasons, it's not serious enough to stop a deal all else considered, just one of those things.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Senior Member DuaneHTP's Avatar
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    Always go for more cubic inches when you have a chance. That's the name of the game in Jet Boats. 502 crate motors are good motors.

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    Senior Member wpy3's Avatar
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    I am trying to find the rest of the pics
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  15. #14
    Senior Member wpy3's Avatar
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    Default Some more

    Here are some with the old motor set-up. I am going out to see the new motor install and will get some pictures
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