{"product_id":"motorshop-e-840-010-3-5-8-inch-piston-set-010-oversize-for-harley-davidson-panhead-and-shovelhead","title":"Motorshop E-840-010 3-5\/8-Inch Piston Set .010 Oversize for Harley-Davidson Panhead and Shovelhead","description":"Piston set with 3-5\/8 inch bore  8.5:1 compression ratio and is oversize .010. Set includes Hastings 3 piece ring set  2 wrist pins and 4 circlips. pistons have a steel expansion control strut cast.\n\u003cp\u003eThe Motorshop E-840-010 piston set is designed for Harley-Davidson engines using 4-1\/2-inch stroke flywheels and 3-5\/8-inch cylinders. This .010-inch oversize piston set is intended for applications requiring a finished bore size of 3.8750 inches. It is a suitable replacement component for restoring or rebuilding select Panhead and Shovelhead engines while maintaining proper cylinder and piston fitment.\u003c\/p\u003e\n\u003cp\u003eBefore installation, verify cylinder condition, bore specifications, piston clearance, and compatibility with the engine assembly. The finished bore must be accurately prepared to 3.8750 inches to fit 3-5\/8-inch cylinders. Proper machine-shop measurement and piston fitting are essential for reliable operation. For installation and fitment guidance, refer to the manufacturer's instructions at \u003ca href=\"http:\/\/www.vtwinmfg.com\/Instructions\/MS\/Piston%20Fitment.pdf\"\u003ePiston Fitment Instructions\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eAfter installation, run the engine at moderate speeds for at least 500 miles to properly break in the new pistons and rings. Avoid excessive operation in lower gears during the break-in period, as proper loading and controlled engine speeds help support reliable ring seating and long-term performance. The Motorshop E-840-010 is supplied as a piston set kit and is compatible with listed 1948–1957 Harley-Davidson FL applications when matched to the correct engine specifications.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eApplication: Designed for engines with 4-1\/2-inch stroke flywheels\u003c\/li\u003e\n\u003cli\u003eBore Fitment: Requires a finished bore size of 3.8750 inches for 3-5\/8-inch cylinders\u003c\/li\u003e\n\u003cli\u003eOversize: .010-inch oversize piston specification\u003c\/li\u003e\n\u003cli\u003eEngine Compatibility: Fits select 1948–1957 Harley-Davidson FL Panhead and Shovelhead applications\u003c\/li\u003e\n\u003cli\u003eProduct Type: Piston set supplied as a kit\u003c\/li\u003e\n\u003cli\u003eBreak-In Requirement: Run at moderate speeds for at least 500 miles and avoid excessive lower-gear operation\u003c\/li\u003e\n\u003cli\u003eCountry of Origin: Taiwan\u003c\/li\u003e\n\u003cli\u003eAccessory Items: 10-1139 - Panhead Cylinder Heads 3-5\/8 inch Big Bore, 11-0380 - 3-5\/8 inch Cylinder Set, 10-1086 - Panhead Cylinder Heads 3-5\/8 inch Big Bore\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment\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 FL  1978\u003cbr\u003e\nHarley Davidson FL  1979\u003cbr\u003e\nHarley Davidson FL  1980\u003cbr\u003e\nHarley Davidson FL  1981\u003cbr\u003e\nHarley Davidson FL  1982\u003cbr\u003e\nHarley Davidson FL  1983\u003cbr\u003e\nHarley Davidson FL  1984\u003cbr\u003e\nHarley Davidson FLT  1979\u003cbr\u003e\nHarley Davidson FLT  1980\u003cbr\u003e\nHarley Davidson FLT  1981\u003cbr\u003e\nHarley Davidson FLT  1982\u003cbr\u003e\nHarley Davidson FLT  1983\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\u003cbr\u003e\nHarley Davidson Fx  1978\u003cbr\u003e\nHarley Davidson Fx  1979\u003cbr\u003e\nHarley Davidson Fx  1980\u003cbr\u003e\nHarley Davidson Fx  1981\u003cbr\u003e\nHarley Davidson Fx  1982\u003cbr\u003e\nHarley Davidson Fx  1983\u003cbr\u003e\nHarley Davidson Fx  1984\u003cbr\u003e\nHarley Davidson FXR  1982\u003cbr\u003e\nHarley Davidson FXR  1983","brand":"Motorshop","offers":[{"title":"Default Title","offer_id":44864783712298,"sku":"11-0238","price":131.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0692\/2285\/8794\/files\/11-0238a.jpg?v=1789683644","url":"https:\/\/atticusgoods.com\/products\/motorshop-e-840-010-3-5-8-inch-piston-set-010-oversize-for-harley-davidson-panhead-and-shovelhead","provider":"Atticus Goods","version":"1.0","type":"link"}