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Old 11-26-2003, 04:47 PM
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Mopar Flat 6 ignition upgrade

I have a 1948 Plymouth. I am in the process of installing a 1953 Desoto 251 CI flat 6 into this car. I have recently freshened the Desoto engine including new Chevy (thatís right Chevy from a 194 CI stovebolt engine) pistons and valves. The bottom end is all new including rods and mains, oil pump, timing chain, and gears. I sent the cam to California for a new profile 260 duration @ .410Ē lift both intake and exhaust. Modified both the intake and exhaust manifolds for duels running twin single barrel Carter B&Bís. Coupled to this engine is a Chevy S-10 T-5 transmission pushing a Mopar 8 ľĒ differential with 3.55/1 gears. I set up a test bench and ran the engine prior to dropping it in the car and it runs great. I have now dropped the engine in the car and I am installing the bolt onís.

This engine is currently running stock points with mechanical and vacuum advance. I have converted to 12 volts negative ground. I am now thinking about doing an upgrade to the ignition. Langdon offers a HEI distributor but the price is a bit salty. A friend suggested I investigate using a Ford V-6 ignition system. In order to do this I would have to graft the two distributors together or somehow modify the ford distributor to work off of the Desoto oil pump drive. This could be done somewhat easily. My biggest problem would be how to make the electrical part of this work. My question is has anyone ever done such a conversion? If so are there any tricks you can tell me about? Is there another 6 cylinder ignition system that might work better? Comments or suggestions will be appreciated.
Don Coatney

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