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  1. #1
    Registered User
    My Boats:
    1994 Super Hawaii 34, 1990 Super Hawaii 34
    Join Date
    Oct 2003
    Fair Oaks, California

    088 heads on Gen 4 blocks

    I know this question has been asked but I see a lot of options. I just bought a boat with one blown 502 mag (rod bearing). I have a pair of 468 short blocks I built for another boat and want to use the 502 heads (casting number 14097088) on the early Gen blocks. I think I read that if you use a Gen VI head gasket it will eliminate the water passage difference between the two. Any help or experience (ie. part number) would greatly help. Im going from efi to carbed so I can get the most from the build.

  2. #2
    Registered offthefront's Avatar
    My Boats:
    353 with Prochargers
    Join Date
    Feb 2004

  3. #3
    Platinum Member Platinum Member Young Performance's Avatar
    Join Date
    Jan 2004
    9 out of 10 times you can not put a Gen VI head on a Mk IV block. Most will leak water into the lifter valley. The easiest way to tell is to put the head on and scribe a line on the under side of the head in the lifter valley. Then, remove the head and see how close the line on the bottom of the head is to the coolant passages. Usually, they are within 1/4".
    When starting with a Gen VI block, you can use any head you want.

  4. #4
    Registered Anarchy Powerboats's Avatar
    My Boats:
    Join Date
    Jun 2004
    Phoenix, Havasu, Newport
    Get some 761 oval port heads?

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