what i mean is blowby, is there more than normal oil consumption with the oil ring below the pin bore. the motor will most likely get taken out at the end of each year for bigger and better things, but just curious if it will eat more oil than a 331. i have also heard that the 347 actually loses some upper rpm horsepower, because of the awkward rod angle, and that it somewhat binds up. these could all be myths though.
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