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  1. #1
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    Default Mild 308 Bosch dizzy vs msd/ice

    Good evening to all, just wondering what ignition setups some of you guys are running on mild 308's I've had a look at the msd and ice kits and they are a lot of $$$ I have also been looking into having my standard Bosch unit from my 253 motor regraphed and just get a msd coil to go with it?? Is it even necessary to have the control unit like the msd 6al for a mild 308 street only car??? I'm happy to spend the money on a msd or ice ignition kit but if I don't have to it means more money for other mods...

    Cheers Tom.

  2. #2
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    The Bosch regraphed and in good condition will be fine

  3. #3
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    Cheers mate should I just run it with a decent coil??? Do I really need a msd 6al type unit?

  4. #4
    Do you ever leave? EH179's Avatar
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    Yep, a rebuilt and regraphed Bosch HEI with the correct coil, will fire 500hp.

  5. #5
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    Ignore everything and buy from the slickest salesman.

    Sorry, what I meant to say is a regraphed HEI is great.

    A programmable ignition is also very nice and arguably more important for a street car.

  6. #6
    Do you ever leave? immortality's Avatar
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    Quote Originally Posted by guy incognito View Post
    Ignore everything and buy from the slickest salesman.

    Sorry, what I meant to say is a regraphed HEI is great.

    A programmable ignition is also very nice and arguably more important for a street car.
    Or you can add a vacuum module....

  7. #7
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    Yep, the smart people run vac adv connected to manifold vacuum for a smoother idle, lower engine temps & better tip in response. Assuming starting with close to or same factory ign specs.

    See below, scroll down to post #6. Written by Lars Grimsrud, a GM engineer.

    http://www.hotrodders.com/forum/vacu...bad-47495.html

    On your ign system, I doubt you could do anything where you could feel the difference by going to MSD 'box' or other. It might pick up a couple of HP on a dyno....

    The MSD #83647 HEI 4 pin module switches 7.5 amps v just under 6 amps for the Bosch. That might be a less expensive compromise if you want to do something to upgrade the ign. This module will not mount directly in place of the Bosch module, would need to be mounted separately on a heat sink; both the Bosch & the MSD [HEI] use a large & small terminal for the pick up coil. These two terminals need to be reversed when using a GM HEI module with a Bosch dist for correct triggering.

  8. #8
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    A regraphed Bosch unit sounds like the go!!!! Here are my engine specs if this will help you help me to decide.. As long as I will extract the most out of this combo with a regraphed Bosch unit that will be the way I will go...

    Motor specs:
    308 with VN heads, flat top pistons, comp 10:1, cam 226 - 241 @ .050" LSA 107, torque power dual plain manifold.

    Tom.

  9. #9
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    You could swap the canister for an E core coil that is more efficient. MSD #8207 or the Bosch GT40 E core coil, but not sure if the GT40 is still available.

  10. #10
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by Trvh83 View Post
    A regraphed Bosch unit sounds like the go!!!! Here are my engine specs if this will help you help me to decide.. As long as I will extract the most out of this combo with a regraphed Bosch unit that will be the way I will go...

    Motor specs:
    308 with VN heads, flat top pistons, comp 10:1, cam 226 - 241 @ .050" LSA 107, torque power dual plain manifold.

    Tom.
    I'd use the whole Bosch setup, distributor ignition module, coil ... Suck it and see..

    I like that cam too, reckon it'll run like a raped ape... If this was mine I would lock the distributor out at around 30 degrees total, the vac advance fair enough for cruise, economy etc but you can try both ways I guess, people always argue about anything vacuum related lol..

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