Reply to "Harmonic Balancer"

I already have one but it is a D2ZX. It probably is better than anything you can buy for the engine now? It certainly has more mass than even the Romac does.

The stock 4v dampener is only safe to about 6,000 rpm. It is one of the reasons the stock CJ has a 5,800 rpm redline.

I have one here in the shop on which the outer ring has come completely off of. Fortunately the engine survived it.

I keep it around to remind me how dangerous the stock balancer on the original engine is.



The Cleveland develops engine harmonics in the 6,000 rpm range (6000 to 7000) that need the mass of the Boss dampener to smooth it out.

"Some" say that it is these harmonics that will crack the block and that the Boss dampener reduces that tendency?

The iron crank actually helps to smooth them out in combination with the heavy balancer. The steel crank is less forgiving on the stock block and is thought that it hastens the cracking?

All of these aftermarket dampeners now are generic. The Boss dampener is specific to the engine by Ford Engineering for above 6,000 rpm operation.

No one knew/knows this engine better than them.



A funny thing about this dampener is that on my engine it smooths out the idle some and when you rev the engine it has this high pitch scream like an Indy engine does?

Those balancers do not come up for sale often. If you can possibly afford it, buy it by all means, even if it needs to be sent out for a rebuild. You WILL NOT be sorry.