The balancer appears to be a 3512017 which was used on HP and truck motors in '70 & '71. This combined with the rods point to a '70 - '71 HP or truck shortblock but with no VIN stamping, and based on the casting date(and the lack of a warranty tag/pin), it would appear to be an over-the-counter 440 in 1971. I'm not sure if such over the counter engines were stamped HP or not. The pistons say it wasn't a six pack engine when put together originally.


Dave