{"product_id":"keith-black-74-inch-flh-fx-piston-set-060-oversize-for-harley-davidson-fl-models","title":"Keith Black KB263.060 Piston Set 0.060 Oversize 74 Inch Harley FL","description":"\u003cdiv\u003e\n\u003ch1\u003eKeith Black KB263.060 Piston Set 0.060 Oversize 74 Inch Harley FL\u003c\/h1\u003e\n\u003cp\u003eThe Keith Black KB263.060 piston set is a.060 oversize kit designed for a 3.438 inch bore, delivering a 9.0:1 compression ratio for Harley‑Davidson FL engines. It’s engineered for 1941–1950 FL models to restore power and reliability during rebuilds and restorations.\u003c\/p\u003e\n\u003cp\u003eManufactured in Mexico to strict standards, this kit is described as a 390 hypereutectic design with forged aluminum construction for durability and precise fit. The kit is sold as a complete overhaul set, including all necessary pistons and components for a full engine refresh. Proper installation is critical; run the engine at moderate speeds for at least 500 miles and avoid lugging in lower gears to properly break in the pistons and rings.\u003c\/p\u003e\n\u003cp\u003eFor installation guidance, refer to the detailed instructions included with the kit. To optimize performance and longevity, consider pairing with: the 11-1363 piston ring set, the Ring-O-Matic ring compressor tool kit, and the connecting rod clamping tool.\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eEngine compatibility: Harley-Davidson FL models 1941–1950\u003c\/li\u003e \u003cli\u003eOversize:.060 inch for a 3.438 inch bore\u003c\/li\u003e \u003cli\u003eCompression: 9.0:1\u003c\/li\u003e \u003cli\u003eMaterial: forged aluminum\u003c\/li\u003e \u003cli\u003eCountry of origin: Mexico\u003c\/li\u003e \u003cli\u003eInstallation note: break-in at moderate speeds for 500 miles\u003c\/li\u003e \u003cli\u003eIncluded: complete piston set with all necessary components\u003c\/li\u003e \u003cli\u003eFitment: Harley Davidson FL 1941–1977 and Harley Davidson FX 1971–1977\u003c\/li\u003e\n\u003c\/ul\u003eKeith Black 390 hypereutectic piston set is.060 oversize and is for 3.438 inch bore. Pistons have a compression of 9.0:1.\n\u003cp\u003eUpgrade your Harley Davidson FL series with the Keith Black KB263.060 piston set, designed specifically for 1941 to 1950 models. These high-quality pistons are engineered to deliver reliable performance and durability, making them an excellent choice for rebuilds and restorations. The set includes pistons with a.060 oversize, providing increased compression and power output for your vintage Harley. Constructed in Mexico, these pistons meet strict manufacturing standards to ensure a precise fit and long-lasting operation. Proper installation is critical; run the engine at moderate speeds for at least 500 miles and avoid excessive running in lower gears to properly break-in the new pistons and rings. For installation guidance, refer to the detailed instructions available at \u003ca href=\"http:\/\/www.vtwinmfg.com\/Instructions\/MS\/KB%20Sym-Asym%20Piston%20Installation%20Guide.pdf\"\u003ethis link\u003c\/a\u003e. The kit is sold as a set, including all necessary components for a complete overhaul. To ensure optimal performance, consider pairing this piston set with recommended accessories such as the 11-1363 piston ring set, the Ring-O-Matic ring compressor tool kit, and the connecting rod clamping tool. These accessory items facilitate proper installation and help achieve a reliable, efficient rebuild. Whether you're restoring a classic Harley or enhancing its performance, the Keith Black piston set provides a dependable solution that maintains the integrity of your vintage motorcycle.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\u003cli\u003eEngine compatibility: Fits 1941-1950 Harley Davidson FL models\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eMaterial: High-quality forged aluminum for durability and performance\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eOversize:.060 inch for increased compression and power\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eCountry of Origin: Made in Mexico to meet strict manufacturing standards\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eInstallation notes: Run engine at moderate speeds for at least 500 miles for proper break-in\u003c\/li\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003cli\u003eIncluded: Complete piston set with all necessary components\u003c\/li\u003e\u003c\/ul\u003e\n\u003cbr\u003e\nFitment:\u003cbr\u003e\nHarley Davidson FL 1941\u003cbr\u003e\nHarley Davidson FL 1942\u003cbr\u003e\nHarley Davidson FL 1943\u003cbr\u003e\nHarley Davidson FL 1944\u003cbr\u003e\nHarley Davidson FL 1945\u003cbr\u003e\nHarley Davidson FL 1946\u003cbr\u003e\nHarley Davidson FL 1947\u003cbr\u003e\nHarley Davidson FL 1948\u003cbr\u003e\nHarley Davidson FL 1949\u003cbr\u003e\nHarley Davidson FL 1950\u003cbr\u003e\nHarley Davidson FL 1951\u003cbr\u003e\nHarley Davidson FL 1952\u003cbr\u003e\nHarley Davidson FL 1953\u003cbr\u003e\nHarley Davidson FL 1954\u003cbr\u003e\nHarley Davidson FL 1955\u003cbr\u003e\nHarley Davidson FL 1956\u003cbr\u003e\nHarley Davidson FL 1957\u003cbr\u003e\nHarley Davidson FL 1958\u003cbr\u003e\nHarley Davidson FL 1959\u003cbr\u003e\nHarley Davidson FL 1960\u003cbr\u003e\nHarley Davidson FL 1961\u003cbr\u003e\nHarley Davidson FL 1962\u003cbr\u003e\nHarley Davidson FL 1963\u003cbr\u003e\nHarley Davidson FL 1964\u003cbr\u003e\nHarley Davidson FL 1965\u003cbr\u003e\nHarley Davidson FL 1966\u003cbr\u003e\nHarley Davidson FL 1967\u003cbr\u003e\nHarley Davidson FL 1968\u003cbr\u003e\nHarley Davidson FL 1969\u003cbr\u003e\nHarley Davidson FL 1970\u003cbr\u003e\nHarley Davidson FL 1971\u003cbr\u003e\nHarley Davidson FL 1972\u003cbr\u003e\nHarley Davidson FL 1973\u003cbr\u003e\nHarley Davidson FL 1974\u003cbr\u003e\nHarley Davidson FL 1975\u003cbr\u003e\nHarley Davidson FL 1976\u003cbr\u003e\nHarley Davidson FL 1977\u003cbr\u003e\nHarley Davidson FX 1971\u003cbr\u003e\nHarley Davidson FX 1972\u003cbr\u003e\nHarley Davidson FX 1973\u003cbr\u003e\nHarley Davidson FX 1974\u003cbr\u003e\nHarley Davidson FX 1975\u003cbr\u003e\nHarley Davidson FX 1976\u003cbr\u003e\nHarley Davidson FX 1977\u003c\/div\u003e","brand":"Keith Black","offers":[{"title":"Default Title","offer_id":44653167706154,"sku":"11-2207","price":203.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2285\/8794\/files\/11-2207.jpg?v=1785888526","url":"https:\/\/atticusgoods.com\/products\/keith-black-74-inch-flh-fx-piston-set-060-oversize-for-harley-davidson-fl-models","provider":"Atticus Goods","version":"1.0","type":"link"}