[SOLD] B&M 420 megablower for big block chevy
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B&M 420 megablower for big block chevy

  1. #1
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    Default B&M 420 megablower for big block chevy

    For sale
    B&M 420 mega blower for big block Chevy

    Completer set up with intake, tensioner, carburetor spacers, linkage, 2 8mm pitch pulleys, belt, pulley hub, and hardware.

    Blower rebuilt once and low use since. No leaks, Teflon and rotors look good, oil is clean, bearings feel tight.
    Reason for sale is I am going to twin turbo.

    Price $2000 plus shipping or ride from Glendale, AZ. I have a diesel jetta so delivery could be arranged for a reasonable price.
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  3. #2
    Manwhore!!!!! Quick99's Avatar
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    Default

    How much for the flame arrestor ?
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  4. #3
    Junior Member Atlanticross's Avatar
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    Hello, I am coming to Phoenix on business in about 2 weeks, quick couple of questions as I am new to any kind of upgrades to engines, I have a regular 454 in my boat with full MSD upgrade to my engine including a new Quickfuel M800 CFM carb, is there a lot more parts I would need for this kind of upgrade? sorry to sound like a novice but I don't want to buy this thing then realize I need about another $3k in parts, I am for going to have to pay somebody to install it which is totally fine, thanks in advance.
    Also how much additional power do you get from this rig being added to a regular 454?
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  6. #4
    Senior Member A handfull's Avatar
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    Cool Buy a matching carb to your Quick fuel. Under drive it. Add much HP/TQ.

    Buy it. Its a good deal. Get another carb. Block power valves. Jump up in jet sizes (maybe 6 just a guess). Add a boost gauge on your dash. Read a pulley chart to figure your 454ci boost with I'm guessing a stock 8/1 flat top piston. Use a large bore 6-71 to guess the 420ci megablower boost. Back off timing to 32 degrees.

    A good set of valve springs might be a good idea.

    You will be amazed on the low end torque gain. Your big boat will plane out with minimal throttle...compared to using everything you got now.

    Go easy on your drive. Don't drop the hammer. Roll into the gas and let the boat catch up to the torque of your motor. Parts do break. ( I've had to back home a few times after a Bravo let go with an M3 Procharged 468)

    Don't be afraid of it. You will only spend maybe a $1000 for a good matched carb and a few hours to bolt it on and get the thing running with gaskets and jets. I would recommend that you work with whom ever you choose to do the work. Learning, and watching...and understanding the mechanicals of your boat will make you enjoy it all the more.

    Once you have a supercharger, you will never go back to a naturally aspirated engine.

    I'm sure many guys will chime in with some great recommendations. Give it a shot.

    Get a couple pullies. Shoot for 5psi for starters and increase it up to 7psi if you think you need more power. Even if your gauge doesn't read boost at part throttle...that blower is packing air into the cylinders and you will be amazed in the power difference. It is a night and day change.
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    Handful............that was very informative for him.........I applaud you!!.........Dragon
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  8. #6
    Junior Member Atlanticross's Avatar
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    Handfull and Dragon, thanks very much for your help, lots of technical jargon I will need to discuss with the tech who works on my boat, but already reached out to the seller and I hope to be in good shape in the next couple of weeks, possibilities for giving the boat some more go is good stuff.
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  9. #7
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    Default bump and additional parts

    this is still available
    I also have 2 600 Holley HP boost referenced carbs and the billet air filter for $700
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  10. #8
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    Default Bump and combo price drop

    Bump to the top

    $2500 for the whole thing, billet air filter assembly, 2 600cfm Holley hp boost referenced carbs, blower and all the hardware and accessories.
    Last edited by KFvdrive; 10-18-2015 at 08:41 AM.
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  11. #9
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    Default bump

    pics of the carbs
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  12. #10
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    Default pm

    Sent pm

    Don
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  13. #11
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    Default Still for sale

    Ttt
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  14. #12
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    Default top of thread/ lower price

    Open to offers. Can separate.
    could take part trade for 5 bolt whirlaway, fiberglass bucket seats, v drive over transom headers, or other v drive stuff
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