Working on a classic Mopar? This Professional Products PowerForce 7.3 Harmonic Damper is built for Chrysler big block engines. It’s a neutral balance damper that comes with two bolt-in counterweights to fit a range of applications. For 1972-'78 383 & 400, '71 383 2-bbl, and '74-'78 440 (cast crank engines), you’d use counterweight #91015. If you've got a 1970-'71 440 6-bbl or a 1971 High Performance 440, go with #91016. Other big blocks might not need a weight at all – check the instructions. It even has extra TDC marks for the 426 street or race Hemi (spacer #81013 required for Hemi fit). Fits most Chrysler big blocks like the 351, 361, 383, 400, 413, 426, and 440. Just a heads-up: it won't work on the early 331, 354, or 392 Hemis. Everything you need is in the box, including full instructions. If you're rebuilding or upgrading your engine, this damper helps reduce vibrations and keep things running smooth. Perfect for resto projects, performance builds, or just keeping your classic on the road. Get it installed and feel the difference in engine balance and longevity.
