Anyone have an urge to build a Hemi jet?
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Anyone have an urge to build a Hemi jet?

  1. #1
    Seriously off center slowride's Avatar
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    Default Anyone have an urge to build a Hemi jet?

    No, not the 392 or 426 elephant motors, but the more plentiful 5.7l's. With the carburated intake kit from XV (with a vac secondary 650 Holley) and a STOCK cam it made 371 hp at 5,800, and 366 ft lbs at 4,800. Add a relatively mild cam and you get 438hp and 6,700 and 390 ft lbs at 4,900.
    The conversion kit is available in a few different levels depending on if you want the carb, programming, etc. Kinda pricey, but definitely unique and not a slouch either.
    And for all the Mopar snobs, I know it's not a "real" Hemi......

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    southwindsforsure justsquirtin's Avatar
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    there is a guy in san fransico who has one carb to pan /old school==5500 new i believe

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    Prune-Picker
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    Quote Originally Posted by slowride View Post
    .... but the more plentiful 5.7l's. With the carburated intake kit from XV (with a vac secondary 650 Holley) and a STOCK cam it made 371 hp at 5,800, and 366 ft lbs at 4,800. Add a relatively mild cam and you get 438hp and 6,700 and 390 ft lbs at 4,900.
    And for all the Mopar snobs, I know it's not a "real" Hemi......
    Whether it's a "real" Hemi is not the issue. The issue is how small a boat you can find to put it in. A 14ft?
    Check an impeller chart. 371hp at 5800 or 438hp at 6700 calls for a "D" or "E" impeller. Try getting your 19ft'r on plane with that. Maybe a gearbox $$$

    Cs

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    Take it up to 6.1, then get a proper cam and you should be able to bring the power curve down in rpms. I'd love to see a new hemi in a boat. By the way, although it's not a "true" Hemi, with quench pads added, it's far more efficient than the old hemis. With a blower, the pads probably don't matter so much, but I'm not an expert.

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    JetBoat Marine Parts&Svc jetboatperformance's Avatar
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    So are we serious here or fantasizing? ,I would Imagine the cost of custom "marinizing" that motor would/could be astronomical ? How bout a Old school Hemi instead

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    Senior Member TwinTurbo540's Avatar
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    I was working on a Blown all aluminum 526 hemi deal for my 19 Daytona for this season!! It would be completly different from the norm on the water, and set up with some big dog parts.... With the lack of no snow and slick roads(collision repair business) it was just going to be way to tight for me to continue the build and still beable to enjoy my boat all season like I do.

    Hopefully in the near future I can continue with the hemi project and see what happens.

    Travis
    I like my women like I like my boats......Fast and ready to get wet at all times!!

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    Senior Member Futs's Avatar
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    I would take one of these anyday..... chemi baby!!!!

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  9. #8
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    Talking Did someone say "Chemi"???

    One of my favorites!


  10. #9
    Seriously off center slowride's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    So are we serious here or fantasizing? ,I would Imagine the cost of custom "marinizing" that motor would/could be astronomical ? How bout a Old school Hemi instead
    I don't know that "marinizing" a 5.7l (or 6.1 for that matter) would be that expensive..... especially compared to just building an elephant motor nowadays. I am (once again) at my boat limit and don't really have an urge to replace one of the 460's with a 5.7. I AM interested in getting rid of the 3.5l in the Mercedes and building a 5.7 or 6.1 to replace it.
    This is more a topic of conversation than a fact finding mission. Maybe someone out there actually wants to build something different rather than the same old BBC or 385 stroker, tunnel ram, blah, blah, blah. Just seems boating is stagnant and a little shift is in order.

  11. #10
    www.highflowdynamics.com LakesOnly's Avatar
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    Quote Originally Posted by slowride View Post
    ....the more plentiful 5.7l's. With the carburated intake kit from XV (with a vac secondary 650 Holley) and a STOCK cam it made 371 hp at 5,800, and 366 ft lbs at 4,800. Add a relatively mild cam and you get 438hp and 6,700 and 390 ft lbs at 4,900.
    The conversion kit is available in a few different levels depending on if you want the carb, programming, etc. And for all the Mopar snobs, I know it's not a "real" Hemi......
    The late-late hemi is gaining popularity among the custom rodders, and some nice parts are beginning to come out for them. As you have posted, there are a couple of good carburetted intake manifolds available.

    Don't know if you would want to replace the late-late hemi's OEM coil-over ignition for your Mercedes application, but for the custom rodders my partners are currently developing a distributor drive system that replaces the coil-over ignition and will utilise a standard ol' distributor dropped into the front timing cover and sticking off at an angle just like the classic hot rod Mopar engines, ignition wires running to the plugs and all. Based on what I've seen so far and knowing what these guys can do, I think it's gonna become a reality. If you go the hemi route, let me kow if you're interested in one of these systems.

    LO
    High Flow Dynamics
    Performance Components for the 429/460 Engine Family


    This post © Copyright 2007-2014 Paul Kane. No copying, linking, printing or otherwise without express written permission.

  12. #11
    Seriously off center slowride's Avatar
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    OK, so you want it to look a little more conventional?

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    Member Pig Pen's Avatar
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    Quote Originally Posted by slowride View Post
    I don't know that "marinizing" a 5.7l (or 6.1 for that matter) would be that expensive..... especially compared to just building an elephant motor nowadays. I am (once again) at my boat limit and don't really have an urge to replace one of the 460's with a 5.7. I AM interested in getting rid of the 3.5l in the Mercedes and building a 5.7 or 6.1 to replace it.
    This is more a topic of conversation than a fact finding mission. Maybe someone out there actually wants to build something different rather than the same old BBC or 385 stroker, tunnel ram, blah, blah, blah. Just seems boating is stagnant and a little shift is in order.
    How about this?


  14. #13
    Seriously off center slowride's Avatar
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    Quote Originally Posted by Pig Pen View Post
    How about this?

    I wasn't thinking of keeping it EFI, but yes. Let's hear some details.

  15. #14
    Member Pig Pen's Avatar
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    6.0L Gen III GM small block. It's a stock motor running on the factory PCM. It's pushing my Taylor SJ to 60 mph with a AA impeller. Had a big block but decided I was tired of playing that game.

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