Not sure how your head work is done, but their really opened up then they want higher rpm. My Hillside build was about 134hp/138tq. I wanted more. Society I went from a woods 9F which was a midrange to a S&S 631. Big difference. Might be too radical for you tho. Need to be sure of your valvetrain also.
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With those numbers... ever have any problems with your tranny? If we are saying a DSSC tranny is rated for 120HP, I'd like to know how yours is standing up. Just wondering. Thanks.