{"product_id":"6-5-olds-v8-350-400-403-425-455-harmonic-damper-80022","title":"6.5\" Olds V8 350\/400\/403\/425\/455 Harmonic Damper - #80022","description":"\u003cp\u003eOldsmobile Harmonic Damper 6.5\" V8 350\/400\/403\/425\/455. This is an externally balanced damper with a bolt-in counterweight which can be removed for a neutral balanced rotating assembly. This damper will work on 330\/350\/400\/403\/425\/455 cubic inch Old's engines. The damper features the stock Old's accessory pulley bolt pattern as well as a Big Block Chevy bolt pattern for those who may want to run a crank trigger system. Use of Chevy pulleys will require some machining to damper. Note: On 330 engines, TDC mark must be repositioned. This damper fits late 400 and 425 only. Early 400\/425 engines have a different counterbalance than provided. A good balance shop can modify counterbalance to work correctly on early 400 or 425 engines.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eIn order to assure a proper fit of your stock accessory pulleys to this damper, the four mounting holes in your pulley have to be drilled out using any one of the following three \u003c\/em\u003e\u003cbr\u003e\u003cem\u003edrill sizes: \u003c\/em\u003e\u003cbr\u003e\u003cem\u003eLetter Size Drill \"T\" \u003c\/em\u003e\u003cbr\u003e\u003cem\u003eFractional Size Drill 23\/64\" \u003c\/em\u003e\u003cbr\u003e\u003cem\u003eMetric Size Drill 9MM \u003c\/em\u003e\u003cbr\u003e\u003cem\u003e**Any of the three size drills will work\u003c\/em\u003e\u003c\/p\u003e","brand":"Professional Products","offers":[{"title":"Default Title","offer_id":46059431690300,"sku":"80022","price":97.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/5934\/4956\/files\/80022.png?v=1787699026","url":"https:\/\/rpm-racing.com\/products\/6-5-olds-v8-350-400-403-425-455-harmonic-damper-80022","provider":"Racing Precision Motorsports","version":"1.0","type":"link"}