Belt size needed after removing smog pump on 472 ?
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500, 472, 425, 368 Discussion, Belt size needed after removing smog pump on 472 ? in Cadillac Engine Technical Discussion; I own a 1973 Coupe DeVille with a 472. I'm wondering if anyone knows what size belt I would need ...
  1. #1
    JRG73 is offline Cadillac Owners Member
    Automobile(s): 1973 Coupe De Ville
    Join Date
    Feb 2010
    Age
    29
    Posts
    11

    Belt size needed after removing smog pump on 472 ?

    I own a 1973 Coupe DeVille with a 472. I'm wondering if anyone knows what size belt I would need in order to bypass the smog pump.

    Thank You!
    -James

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  3. #2
    drmenard is online now Cadillac Owners Enthusiast
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003
    Location
    Massachusetts
    Posts
    980

    Re: Belt size needed after removing smog pump on 472 ?

    You can't just take off the smog pump... One belt goes around the crank , waterpump and smog pump... another goes around the waterpump[on a different pulley] and the Alt. ... If you take off the first one nothing turns the waterpump ... waterpump not turning means Alt. not turning... The only year bottom crank pulley , 1970, would let it work... it was the only year with 2 belts to the a/c comp and PS and one belt for the Alt. .. Complete pulley set-ups from 76 to 79 can be used ... they must have no smog pump... but the A/C and PS pulleys would also have to be changed...you could call MTS and see if he a 1970 crank pulley...

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