428 Vibration Dampner

[TMAN0950]

HI GUYS, I JUST GOT MY 428 OUT OF IT' SHIPPING BOX AND I NOTICED IT HAS NO VIBRATION DAMPNER JUST A PULLY ON THE END OF THE CRANK. MY 390 IS NOT THIS WAY, WHAT DO YOU THINK, THANKS TMAN

[Woodz428]

On early FE engines the pulley WAS the dampener, the later ones (maybe about '68) used a separate pulley /dampener set up. I would guess the 390 is a later model or someone has put the later harmonic balancer on it. You can swap it out if you need to use aftermarket pulleys or get an aftermarket balancer.

[SCOBRAC]

I have an SFI rated fluidamper (20,000 rpm) I got on for $150. It was suppose to fit my 427 but the bolt pattern was wrong. If you decide you want a separate damper you can have this one for $120 +shipping

[ENTDOC]

I would guess that a 427(internal balance) damper would not be balanced correctly for a 428 (external balance). chuck

[ted]

427 and 428 dampers are all factory zero balanced as is the case for the other car Fe's, 410 Mercury included. Only the 428 SCJ was external balanced at the front of the engine and was done so with the cookie cutter (ax head) sleeve behind the damper.

The standard 428's, CJ's, and 410's were external balanced only at the flywheel as they had an additional counterweight on the 1U and 1UB cranks allowing the damper end to remain at zero balance. The 428 SCJ had the 1UA crank which was missing that additional counterweight and needed the extra weight or rotating mass at the front of the engine.

[TMAN0950]

thanks, i knew you guys would know, and i was hopping it would be something like that, thanks tman