I am trying to build an F440 HP 4BBL (assembled Trenton MI plant 8/12/69) as close to stock as I can. I have a conflict between sources as to when in the '70 model year Mother Mopar went to externally balanced 440 4BBL's with the six pack rods, balancer and flywheel/converter vs internal balanced.

If you have a 1970 F440 HP 4BBL with the original unmolested engine let me know the assembly date of your engine and if you have the six pack rods/balancer (eccentric weight)or a neutral balanced balancer.

I walked around the Mopar show at Englishtown this weekend and saw a mixed bag, some internal balanced, some external. The pattern looks like early F440HP's are internal and they didn't go external until the October '69 engine builds.  

are you doubleing your thread or what?  

Nope, I am taking a survey to see if ICCA, Galen, the Parts Manual and the Interchange Manual are wrong about the E86 option.  

so i win anything or what??? lol  

like I said only the 6 pack engines had piston valve relief notches, so go from there  

cripes ,just buy a 73 440 motor home engine and it should have the heavy rods, a better steel crank than the earlier models and the external balance. just see if its a 6 bolt crank flange or 8  

Stamping on the rods #2951906, 70-71 pistoms have a  positive .005 deck hieght, and you need the correct dampner, Mopar3762 8 bolt crank were only in 426 hemis.906 rods were used in motor homes and Police cars.

8 bolt cranks no way.