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500, 472, 425, 368 Discussion, Cadillac Deville 74 472, increasing engine compression in Cadillac Engine Technical Discussion; I totaly agree with Steelybill.. Not only are they not needed with this low revving motor , they have failed ...
  1. #16
    drmenard is offline Cadillac Owners Enthusiast
    Automobile(s): 95 fleetwood 81 deville
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    Re: Cadillac Deville 74 472, increasing engine compression

    I totaly agree with Steelybill.. Not only are they not needed with this low revving motor , they have failed after a short time... Don't get me wrong , they can put out a spark that can scare you and light off any fuel mixture but I would only use them in a race only car..

  2. #17
    josehf34 is offline Cadillac Owners Member
    Automobile(s): Sedan Deville 1974
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    Re: Cadillac Deville 74 472, increasing engine compression

    so if the MSD ignition system is unnecessary on this low revving engine, what ignition system do you recommend?

  3. #18
    Roadmaster75's Avatar
    Roadmaster75 is offline Cadillac Owners Member
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    Re: Cadillac Deville 74 472, increasing engine compression

    Not to be contentious,
    but, in this fellow's case it's Not about HP, or, high revs....
    It's about multiple spark discharge helping to compensate for
    lousy fuels (never intended for this Caddy to run on!) ....... just what this guy needs .... Yes they use versions of MSD's on race cars
    but, the 6A is a known solution & has never failed me on 5 cars now driven on the street all the time.
    Case in point ... a 35 Ford street rod that had cool looking dual quads on a 350 Chevy, but was WAY too much
    carburation. Before MSD ...... 10 miles to the gallon, pooch y acceleration, hard starting.

    After ....16 miles to the gallon, and vast improvement in performance and hot weather starting.

    Since he's in South America I'd opt for effective, low buck, basic solutions before
    removing engines/transmissions, etc.
    my 2 cents

  4. #19
    josehf34 is offline Cadillac Owners Member
    Automobile(s): Sedan Deville 1974
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    Re: Cadillac Deville 74 472, increasing engine compression

    Quote Originally Posted by Roadmaster75 View Post
    Not to be contentious,
    but, in this fellow's case it's Not about HP, or, high revs....
    It's about multiple spark discharge helping to compensate for
    lousy fuels (never intended for this Caddy to run on!) ....... just what this guy needs .... Yes they use versions of MSD's on race cars
    but, the 6A is a known solution & has never failed me on 5 cars now driven on the street all the time.
    Case in point ... a 35 Ford street rod that had cool looking dual quads on a 350 Chevy, but was WAY too much
    carburation. Before MSD ...... 10 miles to the gallon, pooch y acceleration, hard starting.

    After ....16 miles to the gallon, and vast improvement in performance and hot weather starting.

    Since he's in South America I'd opt for effective, low buck, basic solutions before
    removing engines/transmissions, etc.
    my 2 cents
    So you get 6 MPG Extra with a 350 using double 4 BBL carb? This looks awesome! but do you get this MPG driving on highway or city?

    This 4L80E looks good for me http://www.ebay.com/itm/REBUILT-4L80...55dd8c&vxp=mtr what do the experts think?

    A question for Roadmaster75: I see a Caddy Eldorado in your avatar so I think you already own one and I think this has the MSD ignition system. How much MPG do you get on highway and city?

  5. #20
    steelybill is offline Cadillac Owners Enthusiast
    Automobile(s): '85 FWD fleetwood, '93 fleetwood Bro
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    Re: Cadillac Deville 74 472, increasing engine compression

    The GM HEI distributor, the big one, is likely one of the best ever designed, and it's even copied in the after market for other car brands. Seems like a coil with a bit more spark would do the job fine, along with an advance kit for the distributor. Bumping the initial timing up a bit, with a stop plate to limit total timing, would likely be an upgrade you could feel....

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