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  1. #1
    Yellow93's Avatar
    Join Date
    Apr 2006
    San Antonio, Texas, United States

    Whats the difference between a 66V and a 67X head?

    What exactly is the difference between a 66V and a 67X head?? Is one better than another? Can one be cut to yield higher compression?? I have heard some different opinions and want to find out what the real story is! Input from some of our resident head cutting experts would be greatly appreciated!! Thanks

  2. #2
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    League City, Texas
    67X on the 1200R head is the prefix-part number specification. This is evident also on the HLMS parts microfiche. Even if you look at the head gasket, nipple, and someother parts, the prefix can be different.

    66V dictates that the the motor is a 1200cc powervalve motor

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