100% true Charlie.

Cast and forged crank motors are both neutral balance unlike small and big blocks which are internal/external.

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Official Cookie and Mater Tormentor.

That's right. That's why it was a horror story to me when it was discovered and confirmed that the engine builder had stuffed a forged crank in an cast crank motor.

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Casually looking for a Clifford hyperpak intake for cheap.

We don't know that it is. See "Note 1" above; all slant-6s in Australia were forged-crank engines; forged-crank dampers were used as the pattern for this new current-production piece. They're being sold internationally into a market that had a slant-6 variant (cast crank) never seen in the home market of Australia, and they physically fit on all slant-6s, so the vendor is selling them as "1960-1987" items. Another clue that suggests the universal fit claim is an assumption rather than a tested/proven fact: the new dampers have two timing marks — manifold side and distributor side; those were the two setups found in Australia — but there are at least four different timing marks needed for compatibility with all American-market forged-crank engines' timing indicators: the 1960-only setup with degrees stamped directly into the timing cover (distributor side), the '61-'62 manifold-side, the '63-'66 manifold-side, and the '67-'76 distributor-side.

(while checking FPCs to make sure I had the '66/'67 year split right, I found something interesting: '67 police/taxi 225s used a different timing cover with a separate timing indicator, but neither is the same as any earlier-year cover and indicator, and the special police/taxi P/Ns do not appear in any subsequent year. Hmm!)

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

True, but irrelevant. The vibration damper's job is to attenuate torsional vibration in the crankshaft, not to balance the crankshaft (which is done via the flywheel or torque converter on external-balance engines such as the 360 V8 ).

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Crankshaft 101 ! Thank you.

Ok.....So now what ?

Still looking for a balancer.

I,m assuming it is a forged crank.

What are you guys using ? Pioneer,Aussie unit, ?

Not true Dan. All the cast crank V-8's have special dampers with extra weight on them. The dampers do not interchange on V-8's, they will on Slants.

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Official Cookie and Mater Tormentor.

My thinking is, the only way to adjust the damper for different torsional vibrations, is
1) with total mass (weight)
2) effictive diameter of the mass
3) the (not sure of the correct word) flexability of the rubber bond.

Just tried weighing a cast damper and forged damper, but they were too heavy for my"good" scale.
Have no idea on how to determine the effective mass dia.
In my opinion the "rubber bond" is moot, sinse that would change just with age.

Come on, you engineers. How does this all work?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

OK, but the question remains open: why were slant-6s equipped with different dampers depending on whether they had a forged or a cast crank, and a 10" or 11" clutch or automatic transmission? It wasn't because the engineers and beancounters enjoyed creating parts for the hell of it.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Do these damper changes reflect changes in the forged crank?

The early A cranks were certainly heavier than the later ones...

Is the 170 the same as the 225?

Dampers are about harmonics.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

I am reasonably sure there were no consequential damper changes across all the forged-crank years, even though (as you say) the cranks themselves did change.
Yes.
Perhaps what's needed is an harmonica!

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Probably the most important thing is that you buy a new unit rather than one that has been sitting around on a shelf for forty years -- or worse, been in use for forty years.

Dan, do you have any pictures of the different dampers? I have noticed a few different dampers on trucks, since I have been searching junk yards for A/C pulleys. I might be for the accessories, that are standard for certain trucks. I found a cast 3 shieve 1 piece damper/pulley on one truck.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

No.
Could certainly be — sometimes the equipment differences go from Seattle to Portland by way of Topeka — but I have a hard time imagining what front-of-engine equipment difference could involve 10" vs. 11" clutches.
Yeah, I've seen that. Interesting piece; I wonder if the groove-to-groove spacing is the same as the ordinary single-groove damper with front and rear accessory pulleys. Did you notice?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I would guess the cast 3 groove dampers to be industrial pieces. I have seen them with as many as 6 grooves in Yale lift trucks.

Bottom line is that the link I posted is the correct damper for the OP's application.

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Official Cookie and Mater Tormentor.

Bottom line is that the link I posted is the correct damper for the OP's application. :D[/quote]

And I thank you for that......Whew !!!!