429 torquer rebuild

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Other Cadillac Engines Discussion, 429 torquer rebuild in Cadillac Engine Discussion; Im planning on rebuilding my 64's 429 and am trying to get just a bit more torque. I was wondering ...
  1. #1
    deathmachine is offline Cadillac Owners Member
    Automobile(s): 1964 eldorado
    Join Date
    Mar 2010
    san diego

    429 torquer rebuild

    Im planning on rebuilding my 64's 429 and am trying to get just a bit more torque. I was wondering if anyone knows if you can use a cam out of a 472 to accomplish this.

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  3. #2
    ScottConklin's Avatar
    ScottConklin is offline Cadillac Owners Member
    Automobile(s): 64 Coupe Deville 78 Eldorado 85 Seville 94 Fleetwood
    Join Date
    May 2010

    Re: 429 torquer rebuild

    The 429 is it's own little world. Very little interchanges with anything else and nothing with the newer 472/500. You can get a cam custom ground, though. Porting the heads and port matching the intake and exhaust helps, as well. The biggest problem for these motors is they can't breathe and while there is only so much opening up you can do anything helps. There are no headers available but the car can have true duals mounted by a good shop(2.5 inch is as big as you can go). Flowmasters and a pair of resonators at the back sound good and the resonators help prevent fluctuation of PSI and that "tin can" effect, too.

    Also, the Quadrajet intake from the final year for these engines(67?) is a big improvment, both in carb choice and flow, over the 64 intake. By cutting out the base of the breather and welding in a newer QJ piece you can camouflage this rather well(and by opening up the backside of the breather you can increase the airflow without being obvious about it).

    Oh, it IS possible to put in bigger valves if you know a good machine guy. I found a write up about this once but lost it in a comp crash. Again, they just can't breathe so this *might* be a worthwhile mod.

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