Looks like there are four different types of wieghted converters?
Three for cast cranks and one oddity for '70/71-SIX PACK'S'.
The 383/400/440 71-onwards cast cranks have one set of weights.
The 340 71-on cast cranks have their own.
And the one I'm most interested in at the MO, is the 360!
These are obviously all cast crank engines with a few variations in the size of converter, and the size/shape of the balance weights.
Then there is the issue of the 78on Lock-up converters that were fitted in some vehicles but not ALL?
The converters I have got with the 360/727's are both the small variety more common with a S/B set-up. but they also use the large converters in trucks and vans?
In 77 they changed from the more recognisable 'TWO WEIGHTS' either side of the drain plug, to the infamous 'BUTTERFLY WEIGHT'.
This butterfly weight is also used on the 'lock-up' converters to add more confusion TOO!!!
So whats the problem you are thinking, well all V8's need to be rebalanced for piston or rod changes when rebuilding.
Neutral balanced, ie steel crank engines are easier to do as the crank is balanced without the damper and flex-plate/flywheel.
Cast cranks 'MUST BE' balanced with the damper and the corresponding specially weighted converter or flywheel!!!
As a rule the converter can't be used on the balancing machine as its internals are not in a fixed position and any residual oil will throw out the delicate mechanism of the balancer.
So what to do?
The common cure is to not use a weighted converter at all!
How so you wonder?
Buy a B&M weighted flexplate and balance the crank with that instead.
All well and good, but to me this seems like a sledgehammer to crack a nut scenario?
Does no-one in Moparland have a 360 converter, that came from a good running engine/trans that can be photographed for all to see?
Seems not, every site I've viewed in the States has had 'NO IDEA' about wieghted 360 converters and the like.
Its almost become a forgotten ART, the correct balancing of 'cast crank engines,
Just a quick note, I was asked to balance a replica 70 six-pack engine for a guy in the club, but without the factory 70/71 only damper and the 70/71 only weighted-converter, it was impossible without 'Mallory metal'!!!
Oh yes, we are talking about a steel crank 440 engine here!
People all over the world are still making these mistakes with V8 engine balancing!
We live and learn, or maybe not LOL!
Bacca.
