The LT4 harmonic dampener is a dual-mass unit, and the LT1 has a single mass unit. My guess is there is a different harmonic at the higher rpm.

Is there any advantage to putting a LT4 dampener on an LT1 that has been modified (heads, cam ,and such)?

Any disadvantage?



Tom Piper

 

I don't think it could hurt. Not sure what the LT4 unit costs but it might be a good alternative to the pricey aftermarket LT1 balancers.

 

I got a low-mileage LT4 dampener in a swap for an CD ignition system.

I think both the LT1 and LT4 dampeners run close to $400 GM list price -- not cheap.

Tom Piper

 

If you race sanctioned, the GM dampner may not pass inspection.