I sold my firebird, but I still have the crankshaft that came from the motor. The crankshaft is from my 68 Pontiac Firebird 400 motor, my motor ran super strong when it was in my firebird and I want that kind of power from my 69 Chevy Impala SBC 350. I am planning on an engine rebuild for my 350 within the next month or so and I want more power from my motor, I realized that I still had my crank from my Pontiac 400. I am guessing that this would add instant power as the crank is bigger, but Im not sure if this will work. Besides, I would have no use for the crank if I didnt ask to see if this would work first. Any suggestions or help would be appreciated. My 69 convertible Impala is pretty heavy, so I want a strong, more powerful, and more stout 350 upon rebuilding.
Early Pontiac motors are a completely different breed from Chevy's, nothing interchanges. You need to find a 400 Chevy crank and have it turned down to 350 main journals, this along with a .030" bore will produce a 383. Aftermarket 383 cranks are so cheap now that it's not really even worth the time and money to machine a cast iron 400 crank anymore. You can buy a cast steel Eagle or Scat for about $220.00. Cast steel is considerably stronger than cast iron.
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