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  1. #1
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    1999 pro max convert to 300x?

    i have heard that early 300 pro max motors with 2 separate ecu's for fuel and spark. are not desirable motors. i have not been told why. my question is. can pro max be converted to a x motor by changing harness, ecm and parts from the reeds forward with parts from a 300x motor? or can i just send my orig fuel and spark ecu's to someone to raise rev limit from 6150 to 6800? what are the good and bad of both the 300x vs pro max?

  2. #2
    Join Date
    Nov 2009
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    hardyville va
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    Two totally different animals. Nothing wrong with a pro max. You can Simonize it with the opti style intake and X reed plate and make a strong running engine. Still not quite an X motor. the Motorola ecm and the open exhaust chest makes the difference.

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  4. #3
    Join Date
    Mar 2006
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    Port heights also cylinder heads 300pm 64cc 300x 61cc
    there is abit in it.

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