Mark 4 / gen VI cam swap
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Mark 4 / gen VI cam swap

  1. #1
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    Talking Mark 4 / gen VI cam swap

    Has any one ran a mark 4 cam in a genVI. Gotta bitchen hyd roller from my mark4 and would like to run it in my genVI 502. Will it work. Do I need to machine the cam face down to use the gen VI retainer? Are there after market parts for this swap? Do I use my linked lifters or factory spider setup? Are ther after market timing covers other than jesel for this swap like cloyes quick button? torrington bearing, timing set, cam button? any help will greatly be appreciated.

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    LP-25.com Infomaniac's Avatar
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    Quote Originally Posted by super junk View Post
    Has any one ran a mark 4 cam in a genVI. Gotta bitchen hyd roller from my mark4 and would like to run it in my genVI 502. Will it work. Do I need to machine the cam face down to use the gen VI retainer? Are there after market parts for this swap? Do I use my linked lifters or factory spider setup? Are ther after market timing covers other than jesel for this swap like cloyes quick button? torrington bearing, timing set, cam button? any help will greatly be appreciated.
    If you own a machine shop it might work.

    The bolt pattern is different for the cam gear even if you do get the step machined into it. You would have to match up a gen IV top gear with a Gen VI bottom gear timing set.

    And check the length of the cams to see if the Gen VI is longer or not. I have one here I can measure if you want to compare.

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    Some guy obnoxious001's Avatar
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    I believe you can use the MK IV style cam if you buy a regular MK IV style timing set, which in turn means that you need to buy an IMCO timing cover to work with the double roller chain. You would use your regular link bar rollers that go with that cam, assuming they clear the lifter bores, and regular MK IV style thrust bumpers for the timing gear. You would also not use the Gen 6 retainer, so no special machine work would be necessary.

    It's been several years since I did one of these swaps, so I suggest checking further before taking my word for it. The IMCO site does say that the Gen 6 cover clears a double roller set.
    Last edited by obnoxious001; 01-07-2009 at 12:15 PM.

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    LP-25.com Infomaniac's Avatar
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    I have'nt done a swap. Just going through it in my head.

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    Thanks for the info, any body else dealt with this?

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    Boat Nut sleekcrafter's Avatar
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    Gen VI timing cover is it' own beast, same with the Gen V. I'm certain my Gen V roller cam is based of a MK IV billet, has the fuel pump lobe on it. Busby has a nice Jesel Timing belt set-up in the spam section, for the Gen VI

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    It's what we do BDMarine's Avatar
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    You can put a Mark IV cam in a Gen V or VI block. Use a double roller chain, Imco makes an aluminum cover, and use the Crane bump stop p/n 99165-1. The other option is to have another cam made to match yours with a Gen VI nose on it. Then you can use the retainer plate which is way easier because it automatically sets the end play.
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    Thanks bd , I checked into the imco cover. that is the way I am gonna go with it. will the linked lifters fit with out machine work to the gen VI block?

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by super junk View Post
    Thanks bd , I checked into the imco cover. that is the way I am gonna go with it. will the linked lifters fit with out machine work to the gen VI block?
    Not sure we can tell you that, brands vary.

    Easy enough to check with the cam in the block.

  12. #10
    It's what we do BDMarine's Avatar
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    Quote Originally Posted by super junk View Post
    Thanks bd , I checked into the imco cover. that is the way I am gonna go with it. will the linked lifters fit with out machine work to the gen VI block?
    They will work if they are tall enough. Gen VI blocks use a .300 taller lifter.
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    Senior Member Boat 405's Avatar
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    Yes it is doable but a total pita. I've been down this road. IMO use a Jesel drive and get a mark iv cam adapter. You may still have clearance issues and end play issues with that setup. I've got some gen vi cam stuff if you need it. Litters, timing set and cover. Pm me and I can help you out.

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    21 Daytona Outlaw's Avatar
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    Widowmaker Did you have a gen 6 cam in your 502?
    #55

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    Quote Originally Posted by Outlaw View Post
    Widowmaker Did you have a gen 6 cam in your 502?
    Yes I do. But I went round and round with cams, timing gear sets and finally said to hell with it and used the Jesel.

  16. #14
    It's what we do BDMarine's Avatar
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    I don't get how it's a pain in the ass??? Same block dimensions as a Mark IV. The only difference is the stock timing cover. It won't clear a double row chain. Put on an alum cover and it's the same as setting up a Mark IV.
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