Originally Posted By polyspheric
Some damper designs are more tolerant of internal engine mods, in which changes to stroke are probably safer.
If you're not sure, read up.
The "harmonic orders" that cause the problems are not a function of balance, or power, or reciprocating weight. They are far more closely related to:
1. crankshaft length
2. stroke length
3. main journal size
4. rod journal size
5. number of mains

Increases to 1. & 2. reduce overall crankshaft stiffness and reduce the RPM at which harmful orders occur (from which the engine needs protection). Increases to 3., 4., & 5. increase stiffness and increase the critical RPM.

Bottom line: don't use a damper designed for an engine with different crank geometry unless you're sure its design accepts the differences.
A stock 383 has very different crank stiffness from a 4.15" stroker with BBC rods.


Bottom line: Don't cheap out on a balancer.


PSO headed 632 from MM. Cracked cylinder, loose valve seats, low oil pressure, low cylinder pressure.
..... Now its a door stop....