A/A or B cut impeller for my 460BB
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A/A or B cut impeller for my 460BB

  1. #1
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    Default A/A or B cut impeller for my 460BB

    Im running a stock ford 460bb 360hp with jacuzzi 12wj b cut impeller turning 4800rpm at 45-50mph top speed I also have a 12wj a/a cut pump would it make a difference in top speed or take off thanks new to this boating lifestyle any help would be great ...thanks

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  3. #2
    Senior Member Mash on It's Avatar
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    Default wj impeller chart

    The "B" should do the trick.
    Daniel
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    Quote Originally Posted by Mash on It View Post
    The "B" should do the trick.
    Daniel
    thanks bro...if i swaped out the b for the a/a would i have a greater take off an run the motor less rpm to achieve top speed from the pump

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    If u swaped out B for AA you are going to turn more rpm's. The AA will help get u out of the hole faster but on top end have lower rpm's.

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    If the jacuzzi designators are similar to berkeley's, the A/A will give higher top end, lose a little holeshot, and turn lower RPM compared to the B impeller.

  8. #6
    Senior Member Mash on It's Avatar
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    The way I understand it, a Jacuzzi 'B' is similar to a Berk 'A', typical of most stock big block applications. The Jacuzzi 'A' is similar to the Berk 'AA', and I have not seen a jacuzzi 'AA' impeller. I also have the dimensions for the Jacuzzi 'A', 'B', 'C', 'D' and 'E' impellers, with Hardin Marine or NAMJ Part No.'s.
    If going to the 'A' imp, the motor will probably lose ~500 rpm, down to ~4300, on the stock motor. The holeshot may be better but top end MPH will likely be lower. This may be better for a heavy 21' daycruiser, but in a light(er) 18' the 'B' is better suited.
    BTW, this is dated 1986
    19' Glenco, 454, wj, ss 'B' imp, best gps'd 71.8 mph @ 5500rpm, at the river
    Thats all I got, others may know more...
    Daniel
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